Struggling with Self Harm and Fear of Losing My Boyfriend

You two should try to communicate and negotiate. No doubt this is tough for him but he needs to consider you too. Something he could try like Jorda suggested is learning to chop things and hide sharp things away, as well as just talk with you, etc.

I'm sorry you're struggling with self-harm & can't keep the temptations away. One thing you can do is try your best to avoid surrounding yourself with items that may trigger it & unless you absolutely have to. Maybe ask your bf if he can handle the knife during the cooking & cleaning since he doesn't struggle with self-harm. If he doesn't know how to chop, then teach him once so he can handle it from here on. He should be more than willing to try anything to help you with this for the sake of sustaining the relationship.