To the OP, have you been with your boyfriend for long? Rather than anything bad happened, is it that he cares about you?
Sounds topsy turvey, but in my case, if anyone had feelings for me, or proved they were caring I seemed to freeze up and turn them away. I've been on my own long enough to have worked out it was my own self worth problems causing this, that I couldn't really accept someone would value me.
Maybe you need to take some time to yourself interspersed with "dates" with him again, to remind yourself of the early days with him and how you felt then?
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Other people are people too.