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Can you call your cellphone company and see if you can get his number blocked? That might stop the text messages at the very least.

Other than that, I don't think you can do much besides what you are already doing. It sounds like he isn't doing anything illegal, so I doubt you can get any authorities involved or a restraining order. Just be very firm that you are broken up if he comes around, or if he calls/texts just ignore him. Whether he got people pregnant or is engaged to someone is irrelevant to your life, and if you ignore him enough he will eventually give up. You shouldn't have to deal with someone like that, so don't.

I had that same problem with my boyfriend! I swear everything you said what happened with me Does he know he's getting to you? My ex boyfriend kept at it until he realised I just didn't care. He was nothing to me. I didn't pick up the phone when he called, I changed my route to my classes, I didn't talk to the friends who would update him on how I was, I blocked him on Myspace, and changed my email address. He got the message. Before that though he was telling me on how he really liked this girl but he wasn't sure if he wanted to be with her because she was "slow like me." Then he called me later and told me he's going out with her, and after that kept calling about what's new with their relationship. When he realised she wasn't going to put up with his bullshit he said he was going to commit suicide and didn't show up the next day. I was one of three people who knew it was crap, because he pulled that same s**t. His attempts seemed to go on forever but eventually he stopped. Now even if he wanted to he has no way of getting to me. I've since had my phone number cancelled and moved to another city with my mom and step dad.

As long as you ignore his attempts and not look at him whenever you seem him then eventually he'll have to stop. I'm sure at first he'll get even worse to try to push your limits but if you stay strong he has no weapon and will give up.