I hit my boyfriend.

So last night me and my boyfriend went out for drinks and on the way home started fighting. When we got home, the fighting escalated and I gave him a black eye and he's covered in scratches. He went to his parents for the night and we talked this morning. This has happened before and I'm not sure what triggers it. He wants to leave and it's justified but I don't want to lose him. I love him so much. I am looking into anger management counselling for myself. He deserves to be treated better than that. I come from a very abusive relationship with my ex who once had me at knife point. I'm not blaming my past but is there a connection between my behaviour and my past and what should I do so he doesn't leave.