Do you stop liking guys after they like you back?

every time I like a guy I focus so much on getting him to like me. and so far its always worked and he's liked me back, but as soon as he tells me he likes me, I stop liking him. is this normal? none of my relationships have ever laster more than two months because I just always have to admit to myself and him that I don't like him anymore no matter how hard I try to. what can I do to commit to a guy instead of just liking the game of making him like me?
Do you stop liking guys after they like you back?
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