Help me out here Please

I’m dating this guy, he’s absolutely swept me off my feet with his humor and his romantic personality and his looks. But lately he’s been very withdrawn. At least over text. In person when I bring it up he reassures me it’s just work and family issues which I totally understand. But then today, we’d been talking and he stopped responding around 1. Then now, at 6, I see he’s on instagram liking very sexy pics of girls and I’m honestly hurt. I’m on my period so I’m extra angry about it and want to confront him because this isn’t the first time he’s ignored me and went on to like other girls pics. But idk.

What would you do?