Nobody understands anybody. Humans are not predictable. Empirical evidence can never tell the whole story. Life is like a box of.... wait, wait, not that one.
He was a 'bad boy' in the sense that he used to bully people to bits about their looks and crap like that. Also he tends to be quite unfriendly to people because of their looks or whatever. I suppose he was that way to hide the fact that he was shy with women he had an interest in. He has many girlfriends and isn't shy when it comes to socializing randomly. Also, he mostly focuses on his studies at uni, the whole going out and partying till the cows come home started after second year exams ended.
I'm not a needy person, I just invested a lot in this relationship, and the simple fact that he had been so seemingly in love just a few weeks before is what gets to me. Also, the fact that I haven't gone constantly calling or texting him means that I am in no way or shape going to become a 'stalker'... I've had relationships before, and he hasn't, so yeah maybe he does want a chance to go out and be with other women, and yeah, people do change. But in a few weeks? It was just ******* shocking really.
Because you're clearly a pain.