It sounds like you are trying to make this into a personal relationship--- which it is not. You want him to be "interested" in you, but that is not the point of therapy. His job is to help you with whatever you may be struggling with. It makes sense that if you are lonely or lack other sources of support in your life that you would want to relate with him like a friend (or more), but that isn't what he's there for. It is irrelevant whether or not he finds you "interesting." Therapy is about you and your feelings, not about him. If you do not feel that he is helping you work on your issues--- or "therapy" has become lost amidst your desire for his friendship/interest, then maybe it is no longer beneficial for you. It's not that you are doing something "wrong," but it may be unproductive or unhealthy. I don't think the issue is about sharing a song or a text-- it's about the motivation behind it. If you simply want to share it with him so that he will find you more interesting or you want to develop a personal relationship with him--- as opposed to sharing it so that he understands your struggles or goals better-- then it may be crossing past the line of being "therapeutic."