advice no tip

mmmk. so I've been with this guy for two years. I always tell him I love him and on occassion I will talk about marriage. Him, on the other hand has told me he loves me maybe 3 times in the last year. He also says that he doesn't want to talk about marriage because he's too young. He's 23. I love the idea of love and marriage, but I'm starting to think he has a commitment issue, and will never get over it. I've explained this to him and it starts an argument. I don't want to bother him about it, but its like torture for me. Should I call it quits and move on?