Break up advice??

Been unofficially going out with a boy since April. We were constantly talking bout making plans and the future. And last week he asked me to be his girl friend. Was supposed to go out with him today but he had to cancel last minute. I wasn’t talking to him all day then. Just as I get into bed I get a text saying. Can we just be friends? Since it is literally so out of nowhere I ask why, obviously, and he says because he’s not ready for a relationship.

Please help a girl out, how do I get over this, I feel like I’ve completely wasted my entire summer, I have to see him in school next week and I still have one of his jumpers I need to give back.

Any advice on this at all will be appreciated. Xx