Am I being stupid or is he in the wrong?

Recently my partners been doing things I don’t agree with.

A few days ago I seen he was liking this one girls pictures on Instagram including bikini pictures (this girl tried to split us up years ago).

Yesterday he was drinking and he told me he was gonna go to his mums to drink with her and her partner, once he left he posted a snapchat to his friends (accidentally sent it to my sister) saying I threw him out With a picture of him and a bottle of wine 🤔.

I looked on his phone last night (I know I shouldn’t have but I don’t trust him at the moment) and he said to one of his friends that I couldn’t attend his friends 30th party and said ‘thank fuck’ and that he’s gonna buy drugs (he’s hot taken drugs for years because I don’t like them and we have a 2 year old I don’t agree with drugs being around her or him under the influence).

With all of this above I feel like he’s totally taking the piss out of me, I feel so stupid and hurt. I’m nothing but nice to him and I’ve been loyal these past 4 and a half years.

What do you all think?