What the heck...

So I just noticed my husband messaged 3 other women via Facebook messenger asking how they are doing (notifications popped up on his phone so I looked). One of them, he messaged at 4:30am last night asking how she’s been......am I overreacting? How do I bring that up? I am FURIOUS.

EDIT: he said they are all his friends and they’re super cool...lol k