So, history... I'm 21 and my ex boyfriend is 20, we dated when I was a junior in high school and he was a sophomore, it was a very short-lived relationship (we dated for 3 weeks, at most). I broke up with him because there was a guy that I had liked and known for much longer than him, and we really wanted to date and see where things would go. Yes, it was a horrible thing to do (break-up with him for someone else) - but if my heart wasn't in the relationship, I wasn't doing him any favors to keep it going. Anyway... over the years we've been friends, we've almost always been there for each other - occasionally we would just stop talking for a while, no specific reason.
He's dated a few girls over the years, I've dated a few guys, and he is currently in a relationship. So we hadn't spoken for probably about a year, and the other day I saw him at our college campus (didn't say anything), but I texted him a few days later just to see how he had been.
So I have no idea why, but ever since I saw him a few days ago, I can not stop thinking about him. It's like, at the worst possible moment I'm realizing how wrong I was a few years ago - I just have no idea where this came from. I was completely over him as anything more than friends until I saw him again.
Any ideas why? Also, what can I do to make it stop?
Sorry if the punctuation and grammar is all over the place, was just trying to hurry and get it out. :)