I've been cheated on again :/ What do?

I don't think I'm ready right now to fill you all in on the situation but I asked if she needed a break for the summer a few weeks ago and she told me no. She is doing this mobile camp thing where she goes all around the state being a camp counselor for underprivileged kids. She cheated on me with a guy from work.

I'm living with her and her parents because we both hated being apart from each other. I'm definitely thinking about going home to our apartment. I love her, even though she ripped my heart out. It may be her fault for cheating but I haven't been the best boyfriend for a while and we've been really rocky lately.

I can't handle all these feels. I need to be cheered up. Please! What can I do to get through this?

EDIT: I'm a male, she's a female, we're both 19 and we've been dating 2 1/2 years.

TL;DR: Girl of my dreams cheated, wat do?