My first heartbreak took a toll on my personality. I've developed crushes on several girls following this event and everytime I saw them talking to another guy, I assumed that they were "doing stuff" with them or were dating them. Simply put, I am afraid of being cheated on again or being led on. I don't want to drag this mindset into a future relationship. I realize this is bad for me and I want to know what I could do to get rid of it. Any advice will help. Thanks