I feel empty when he leaves

Just what the title says. We've been dating for 4 months and lately as we've gotten more serious every time we're together and he leaves I just feel empty emotionally. He's not the corny type so I never hear from him how much he cares or like me or anything at all. All I've ever gotten was an I love you and he said it "accidentally" and I was told he "didn't know yet" so. I don't know what to think or feel