How do I convince myself that the relationship is over?
I'm 22, I was with my boyfriend for 3 years. We broke up about 4 months ago, haven't heard from him or seen him in those 4 months. I had a new boyfriend for about two but we recently broke up as well. For some reason, I can't stop thinking about my boyfriend of 3 years. I know he's not right for me, I keep myself busy with friends and school, tell myself that it wouldn't be right to get in contact.. but I can't get over him. For some reason, deep down, I feel like we will get back together... and I can't convince myself otherwise. I have no idea how he feels about the situation since we didn't really have any mutual friends and I haven't heard from him. The break up was kind of messy and basically ended with me finding a text in his phone from another girl and then him him finding I hung out with a kid I've always had a crush on (as revenge for the text in his phone).
Any advice on whether I should contact him.. if not, how do I convince myself its over for good?