Well, the first step is letting it go and not trying so hard to get him to like you. The truth is, you can't turn off your feelings immediately, so there's a chance he may catch up with you. Just being his friend works as well; it helps him get to know you. Sabotaging his relationship so he can break up and be with you isn't a good idea at all. Sometimes, a person can like you back because you want them. However, it's not smart to wait around for that.