Moment of weakness

I recently started talking to/ hanging out with my ex boyfriend again. He’s made it clear he wants to get back together but I would like to take things slow. Taking things slow didn’t really work out though. Last night was only our third time hanging out since reconnecting and I was a bad girl. Watching a movie quickly turned into me spreading my legs and letting him go at it. I don’t regret the sex, it felt really good. I just wish I could’ve waited a bit longer. I don’t want this to complicate us working on repairing things. It’s just hard to resist him sometimes and I barely even put up a fight. Was it stupid of me to give in so fast when we have things to work on?