The situation with him is quite complicated, and I don't feel comfortable telling him that I have BPD or explaining the concept of FP yet. However, he's been noticing little things that give it away, like me suddenly developing an interest in his hobbies or his taste in music, and he's mentioned that it seems like I pick up his speech patterns or random phrases that he uses. He's also asked what kind of music I listened to before I got into the bands that he likes, and I wasn't sure how to answer because my taste in music was very different before. I got really upset when he said those things, and want to find some kind of way to hide the hobby copying tendencies. Somehow I don't feel like he'd understand the concept of FP even if I tried to explain it to him, and would be disgusted by the fact that I do this in some way. I've also had people abuse the FP relationship with previous FPs, so I'm scared that something similar might happen again.

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Would somebody maybe have some advice on how to stop doing this, or how to explain it away in a way that doesn't make it obvious to him that he's my FP?