Sarah Jessica Parker decided to prolong her relationship with Robert Downey Jr. for one specific reason. It seems Parker decided to stay with Downey Jr. during a dark period in his life when the actor was struggling with addiction. Worried about what might happen to him, Parker stayed with Robert Downey Jr.

Related: Why Robert Downey Jr. Went To Jail And The Dark Truth About His Experience

Some celebrity relationships seem to be filled with drama, while other couples seem to share a real connection with one another. It appears Robert Downey Jr. and Sarah Jessica Parker enjoyed the time they spent together. The two were together for close to eight years. However, they began having problems in their relationship. For one specific reason, Sarah Jessica Parker decided to prolong her relationship with Robert Downey Jr.

Sarah Jessica Parker And Robert Downey Jr. Were Together For Years

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Many celebrities stay together in relationships for years, sometimes for the rest of their lives. Some celebrities seem to have really strong bonds, while others can have a lot of drama involved in their relationships and breakups.

Sarah Jessica Parker and Robert Downey Jr. began their relationship in 1984, when both of them were 18 years old, after meeting on the set of their 1984 film, Firstborn.

It seems the two hit it off, and reportedly they even moved in together after several weeks of dating. It appears they were happy together and seemed to have a lot of fun with one another.

According to InStyle, Parker and Downey Jr. seemed to enjoy their relationship. "Parker admitted they'd throw water balloons at their neighbors from the windows of their Hollywood house. She also said neighbors would retaliate by spraying the 20-year-olds with a garden hose."

According to Showbiz Cheatsheet, the Chances Are actor's father, Robert Downey Sr., was happy about the couple's relationship. He stated, “I thank God for Sarah Jessica Parker. Without her, Robert would go at 100 miles an hour into a brick wall. They’re very sweet together. He might become a gentleman as a result of this.”

Related: Here's What Helped Robert Downey Jr. Battle His Addiction

Even though the couple was happy together, it appears Downey Jr.'s demons began to drive a wedge between them that would eventually result in their breakup.

According to InStyle, the Iron Man actor discussed their relationship with Parade. "I liked to drink, and I had a drug problem, and that didn't jibe with Sarah Jessica, because it is the furthest thing from what she is. She provided me a home and understanding. She tried to help me. She was so miffed when I didn't get my act together. I was in love with Sarah Jessica...and love clearly was not enough."

Why Did Sarah Jessica Parker Prolong Her Relationship With Robert Downey Jr.?

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Celebrities stay with their partners or spouses for a variety of reasons. Usually it's because the couple loves and wants to be with each other, but if there are complications in their relationship, and they fall out of love, couples might remain together for other reasons.

While Sarah Jessica Parker was in a relationship with Robert Downey Jr., she chose to stay with him even though she knew their relationship wasn't working, out of fear he could die.

According to Cheatsheet.com, Parker told the WTF podcast, “The biggest hardest choices about those kinds of relationships are feeling brave enough to leave, even if you think they’re going to die. Because you stay, not because you’re in love anymore-You love this person, and you’re afraid they’re gonna die if you aren’t there to shore up their base every single solitary day… I just didn’t want him to die.”

According to Celebretainment, the Sex and the City actor told People she was afraid for Downey Jr.'s life. But in the end, it seems Parker realized she wasn't the person who could help him, and needed to separate herself from him.

She revealed, "There was a huge amount of time spent making sure he was OK. At a certain point, I had the courage to say, 'I'm going to walk away and I'm just going to pray that you don't die.'"

Parker also revealed that "she didn't know for a long time" about Robert Downey Jr.'s addiction to drugs. However, she did wonder why her boyfriend's heart would be beating so fast.

She said, "I was like, 'Why is his heart beating so fast? Don't do so many pushups before bed!'"

Sarah Jessica Parker 'Doesn't Regret A Thing' About Her Relationship With Robert Downey Jr.

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When celebrities end a relationship, sometimes the two people involved in the relationship will part ways on amicable terms, remaining friends. Others might have a public feud, with angry words exchanged between them.

Related: Camila Cabello And Shawn Mendes Break Up, But Can They Remain Friends As They Claim?

It seems Sarah Jessica Parker and Robert Downey Jr. have fond memories of their time together.

Parker told People during her interview, "I will say, I don't regret any of it. I don't resent the time spent."

According to Vanity Fair, the Failure To Launch actor also discussed what she learned from her relationship with Robert Downey Jr.

She stated, “It taught me how I love, and what’s the difference between loving and taking care of people and what’s necessary and what grown-ups should and shouldn’t do for one other. And maybe it taught me a little bit about being a parent, too, because the things that I ended up caring about and the way I cared for Downey, were things that might be more suitable for a parent."