My 22F stepmom 38F was drunk but it’s still crazy.

My boyfriend is 26M. We were celebrating my boyfriend’s birthday. My stepmom loves to drink and she’s been drunk on many occasions. Usually she just becomes a louder and chattier version of herself. Shes gotten angry drunk a few times too. Maybe what kind of drunk she becomes depends on her mood.

I have never gotten drunk and I don’t drink alcohol so maybe I’m ignorant on its effects but I find it hard to believe alcohol can bring this out?

Please correct me if I’m misinformed.

My boyfriend was sitting on a chair, but like reverse so he had his arms crossed, resting them on the backrest, and his head was on his arms. We were watching a game on TV and the birthday part had kind of winded down. Most of the guests were gone.

I was cleaning up. My stepmom was lounging outside and smoking. I missed some of the approach but my boyfriend said she just came up to him and she was slurring her words and the tv was loud so when she said something to him he didn’t catch it so he gestured for her to come closer and say it in his ear. She leaned in and told him “You’re so handsome. Movie star eyes”. He said he just smiled back up at her and kinda laughed it off. He could tell she was very drunk.

The rest of it I saw for myself. He returned his attention back to the tv. She reached out and touched his chin to get him to look back at her and then she leaned in and my boyfriend told me she said “happy birthday darling” and kissed him on the cheek and then suddenly on the mouth. If that wasn’t enough, she tried to kiss him again (on the mouth) but he pushed her face.

She laughed and I was so shocked I was frozen I don’t even remember what I said but I said something. I remember my boyfriend’s friend said “did she just kiss you?!”

My stepmom just laughed it off and told us “don’t make a big deal out of it, it was an accident”

She won’t so much as apologize but when she got sober she approached me privately to tell me not to tell my dad.

AITAH if I tell my dad? Or is this really just not a big deal. I don’t want to cause stress for my dad. But I think this is a little too big to file away as a “drunk oopsie” (her words) and just forget about it.