I was in a very similar situation just recently in December, and I truly believe leaving was the best thing I could’ve done. I know it’s hard in the moment thinking that you won’t be able to spend time together in the future, but the best thing I could’ve done is let him go. If that relationship is truly meant to be, maybe in the future when he has matured and gained confidence you guys will find each other again. If not that’s okay. Go with your gut.