In my experience with this same issue, the scars were no big deal to any of the guys I dated. They could care less. It's not really the scars, but your actions. Now, if you like, cut during the relationship, that could really bring up some issues for him, i.e. he might think his being with you isn't making you happier, etc. So, in my opinion, don't worry so much about your scars, worry about getting yourself better