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Therapy is good, but so is being happy, if she doesn't have any proof that your boyfriend is dangerous to you or abusive then I don't see what is wrong with you staying with him. You are 20 right?
I would say ur mom is just plain worried
BUT the cutting... that is worrisome....STRESS can B just tossed of the shoulder like rain, U know it happens and there is not nothing one can do about it but just let it slide. Then again maybe ur mom sees something troubling BUT then that is A mom 4 ya which is kind of like the sun, moon stars, rainbows and damm biting flies...all of which there is nothing one can do about them but just enjoy...!
((((HUGZ))))
I'm not sure I should say much more than that without knowing more about your boyfriend, but I suspect if he "scares" your mom, there must be a reason behind it... and chances are that she is simply concerned for her daughter.
Hope it works out for you.