Worried boyfriend does not love me as much any more

I have been with my boyfriend for almost a year, and I do not know if I am being paranoid, but for the past few weeks he has not seemed as enthusiastic with me. We had some problems in our relationship, and then after one big argument, he admitted he had considered leaving me, but then realised it was stupid and he never wanted to. I admit it scared me a lot, as I really did not want to lose him, and so I was then determined to try harder, which I did. Things were great, and he was really loving. I saw him (we are in an LDR) and it was great. He even cried when I left. Since then, I have seen him once, and things seemed fine too, except we had one argument, because he got the wrong idea about something, but I apologised a lot. He has not said anything like he misses me, he can't wait to see me again, or what a great time he had, stuff like that. I will see him again quite soon, but I was just surprised because he was sad the last time we left each other, but this time he did not seem bothered at all. He never says stuff like how much he loves me now, and whenever I try to say nice or romantic stuff he just says ' :) ' or 'yeah', or 'me too'. He just doesn't seem bothered to say anything sweet any more. I know he is not stressed about anything, and he told me he isn't. I asked him if anything had changed between us and he said no. I just feel like I am talking to a friend and there is no enthusiasm from him, and it makes me worried. He does not even give me reassurance now. I was upset about stuff and I felt like he could have said nice things to assure me but he didn't really. I am scared to ask him about this though, I don't want to make him mad and for him to leave me. Does anybody have any advice? Thanks a lot.

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