I don't really know what advice to give, but I don't think talking to your boyfriend about your urges will necessarily make your relationship all about self-harm, etc. Sometimes you just need someone to tell you that it's not a good idea, like you said, and talking can help. :)
Maybe you could try and talk to him about it, but let him know that you're worried about it affecting your relationship too?
I hope you're ok, xx
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