I cut my boyfriends penis (AGAIN)

I was giving my boyfriend head tonight and I cut his foreskin with my teeth. When he gets close to cumming he starts bucking up and down. It was hard to keep up with his sporadic rhythm but I tried my best. When I pulled off to clean him up I realized he had 3 cuts about 1-1.5cm long and 2 small ones. I feel so bad right now. Last week I accidentally cut him too but that time wasn’t as bad cause he wasn’t moving. When we had sex earlier today though, after not seeing each other for a week, the cut split open. So now he has cuts from two occasions and I feel like they’ll take a long time to heal. He’s the biggest guy I’ve been with and I’ve never been with a guy that was uncircumcised before. Does anyone have tips for how to avoid this? I’m also trying to think of how to make this up to him. 😓 He’s being so kind about it cause he knows how bad I feel.