male friend trouble

So I became friends with this guy this year. He is friends with my other friend (lets call her Jane) but before this year we weren't friends. So when we became friends everything was nice. we had a little group. we took the same route home every day and we were pretty close but never as close as he or I was with Jane. But over time I started to get the feeling that he liked me. this lasted about a month until the time he and some other kid and I were talking about crushes. when i told him I liked someone he seemed to get a little excited but when he learned it wasn't him he seemed a little disappointed. It might just have been because he didn't like the person I like, but when I asked him who he liked he was oddly vague. And ever since then our relationship has kinda sucked. Before he was friendly and would sit with me in class but now he turns me down when I ask him if he wants to go to lunch or something. I invited him to this biannual event at the beginning of the year and he went with me happily and seemed to have fun but when I asked him again recently he said no. when i asked him why he shrugged. This might just be a one time thing, maybe he wasn't feeling good but things have been distant between us. I don't know what to do. I want to be friends with him again because he's real fun to be around but I don't know what to do. He is still great friends with Jane so I know nothing changed with his friendships. please help