Relationship ran its course

Okay so I really need some advice. I've been dating this great guy for more than 4 years nowand he is the nicest person, like nothing is too much trouble for him andeveryone says you can tell that he is completely in love with me. I know thatmight sound big-headed, but I'm just giving you the detail. Anyway, I've been at Uni 2 years now and he works away a lotso we can go months without seeing each other. This was okay at first, butlately I've been feeling different about the whole relationship. It's the factthat I can go months without seeing him and I can cope with it, whereas heseems to be missing me all the time. So lately he's been talking about marriage and how he wantsto propose soon and this is completely freaking me out, I'm not even 20 yet soI feel completely suffocated by the thought of it. I know it sounds clichéd butI do love him I just don't think I'm completely in love with him in that way. I think that because we've been together so long, ourrelationship is just comfortable, we're together because it's what we're usedto and that is how it has always been, but I don't feel as though we can takethe relationship any further. I'm not sure whether it's time to end things now, I knowthat I will miss him but I want to have my own life at the moment, I feel tooyoung to settle down and marriage is the LAST thing on my mind. I was justwondering if anyone had advice on what to do?!

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