I don’t care anymore

My boyfriend dumped me a couple weeks ago and he told me it was because he was not happy with me anymore. But to tell the truth i’m pretty sure it was for another girl. He went to a retreat at his college and while he was away he was all weird with me. When he got back he broke up with me. Β After we broke up he blocked me on all of the social media sites. But he doesn’t know I can still see his tweets. He found a girl while he was on the retreat and they are talking now. We had been dating for a year and 10 months. Should I care that he just threw away all that time? Or not? Because he was always telling me who I can and can not talk to and other things. I just don’t know how to be happy again. Any help?