[Kevin]

It sounds to me like OP wants to be free to hook up with other girls as part of his anticipated college experience. If it's his desire not to be monogamous, he needs to consider whether his current relationship should even still be monogamous right now. If he's saying he's worried he's going to have a casual hookup or that he wants to be able to have a casual hookup, staying in this relationship isn't respectful to her.

I just don't think you can really "love" someone in a relationship sort of way and also think you want to have casual encounters. It seems this relationship is over.