Me and my partner were having a tiff over something trivial but I could see he was visibly annoyed. About a minute or 2 into the disagreement my 6 yo son hit him playfully but forcefully (they always play fight) and my partner (step parent) reacted and pushed him. It wasn’t a playful push, he was annoyed at me and this resulted in him pushing my son as a reaction to the punch. This took my son by surprise but I quickly reacted and went mad at my partner then took my son upto bed. My son was crying but I don’t know if that was because of my reaction or because he was genuinely upset. He said it was a forceful push, but it wasn’t strong enough to push him over/into something.
my partners initially response afterwards was “well he shouldn’t have hit me”. To me this is completely irrelevant. My son did it playfully, and he’s a child. My partner is an adult and should know that’s not ok. He has since been very apologetic and says he knows he shouldn’t have done it, it was a reaction to being punched and stopping it. We’ve been together 4 years but living together only 6 weeks. He’s otherwise been good with the kids and they’d be very sad to see him go.
I know this is absolutely not acceptable. It’s got me questioning everything. AIBU to think I need to end the relationship? I don’t trust my own judgement anymore, am I overreacting?