"I don't know what love is"

My boyfriend and I are both 22 and have been together for almost 2 years. A few moths ago we decided to move in together in September. I was very happy with the way things were going between us. We hardly ever argued, we have a lot in common, but we are also different in many ways, which makes our relationship quite interesting. I get along with his family and friends, and we always had a good time together. I should have known this was too good to be true. A few nights ago, we got talking. I asked him if he loved me, because he has never said it to me first. When I tell him I love him, sometimes he says it back, but most of the times he just smiles and looks away. I didn't think too much about this before because he's the kind of person who finds it very difficult to talk about things like that. I didn't want to put pressure on him. But when I asked him directly, he said he didn't know. He says he feels too young to commit to me in the long term and he doesn't know what love is. This broke my heart. I asked him why he agreed to live with me if he felt this way and he said he didn't know. I don't know what to do now. I really love him and had no idea he felt this way. Some of you may think I'm too young, but I feel I'm ready for a serious, committed relationship. He only just told me he doesn't want it yet. But he also says he doesn't want to break up! I'm really confused. I have tried speaking to him about this so many times, but he mostly responds with "I don't know". He also said that he thinks I'm very naive for thinking we would last forever. We have already signed a contract to live together next year, so there isn't much I can do about that. We'll have separate rooms (to keep our parents happy!), so it wouldn't be too awkward if we broke up. But at the same time, i really love him. I have been with guys before, but i have never felt this way about anyone. I feel led on and lied to, but I'm scared that if i end things I'll never find anyone who understands me as well as he does. I would really appreciate any thoughts, comments or advice on my situation!

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