Breakup trouble 💔

2 weeks ago today my boyfriend of almost 5 months broke up with me. At the moment you're probably thinking "5 months? That's not long at all" but I loved each and every day with him. I even started to love him. 
Ever since that day things have been really hard, this my first breakup that I didn't end. He said he wasn't good enough for me and left; I know he still has feelings for me just not as many. I catch him everyday looking at me during breaks (since we both have the same friends) but the downside to that is that I feel like I can't smile about it. 
I don't have a clue about what to do 😔