My mom and my SO

My mom has been acting weird lately, she has been staring down my SO which she usually doesn't pay any mind to and she's been walking out to tell me goodbye in no bra and tank top with shorts after I leave her house( I babysit my sister till she gets home) and she tells him him hi and just stares at him up and down and still goes out there being super weird, I brought this up to him and he said he doesn't care and doesn't notice, but I can't say anything to her because I'm going to come off as controlling or insecure, but idk why she's been acting like this lately 🤔

Edit: He's not my bf we've been together for 8 years and we have two kids together, I kinda wanna tell her husband because she is always trying to get attention from other guys