need help please

so when my bf is mad I have him take his anger out on me. like choking not hitting. he feels bad afterwards but ik it helps him with his anger. It was my idea not his. but would this be considered a toxic or abuse relationship if im okay with it?

I don't want people to know who I am but I do it as a stress reliever for him. I've always been mentally abused and I've had some serious issues with depression. he will never lay hit me out of anger just choking for about 3 seconds then stops. he doesn't leave marks and nobody but you guys know