Help, first heartbreak :(?

Hey, I'm a junior in high school. I have been dating the same guy since 8th grade. He was my first real boyfriend. We did everything together and he was one of my best friends... we talked all the time, and we were really in love. But, we did have a lot of arguments. He eventually broke up with me because we "fight too much". This was three weeks ago... and I'm still really sad about it. I can't stop thinking about him and I'm always wanting to check what he's doing or even message him. When he broke up with me he blocked me on everything, ignored all my calls, sent all my calls to voicemail, told me to leave him alone. It was very heartbreaking and sad because I was confused as to why he didn't want to talk at all, I mean, I didn't even do anything... A few days after I didn't text him, I got a message from him telling me he still loved me. I think it's a lie, because if he loved me he wouldent be so mean to me for no reason at all. Also, I found out he was talking to a bunch of new girls right after we broke up :(... I'm just really sad over the situation. I'm scared he likes another girl, and that he will get a new girlfriend before I move on. I've been so depressed the past 3 weeks and I don't know what to do. Will I ever get over him? I'm scared I will feel like this forever :( what am I supposed to do?
Help, first heartbreak :(?
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