I really screwed myself this time

Well I've been seeing this guy for 3 months. At 2 months he told me he still had feelings for his ex but if I wanted to hangout still we could. And me being stupid didn't want to let him go. We hung out everyday of January and I fell completely head over heels for him. I know it was stupid, and now I'm stuck. I love this guy, and it sucks because I don't know what to do now. Leaving seems like the right thing to do but it hurts. A lot of my stuff is at his house so I'd have to go get it but I don't know if I should wait till he invites me over or just go get it and leave a note telling him I'm sorry but I can't do it anymore. My heart is breaking because I am so torn at this point.