Is this normal male behavior?

I’ve been in a long term relationship with my fiance for 11 years now. We play fight a lot and mess around all the time it’s all fun and games until it’s not. In these 11 years he has choked me out cold 2 times. The 1st time was 5 years ago I was literally on the toilet lol he made me pass out and hit my head on the shower doors and the most recent was just the other day! I was cooking breakfast for him and our kids and he just came up behind me in the kitchen and knocked me out and next thing I know I was on the floor! Infront of our kids! (We have 2) Both times it was completely unprovoked and I had no idea we were gonna mess around. Now he does not abuse me in anyway other then I guess being too agressive with choking. Is this low key DV? Is this something men do? Does he just not realize how much stronger than me he is? He’s also very apologetic after he realizes what he’s done.