Husband being flirty with waitress

My husband and I went out to eat and the eeentire time he was being so flirty to the waitress trying to impress her. Then he said “oh she looks familiar I know her from somewhere”. And then when it came time to pay he gave her a $9 tip. He usually only does about 5-6$ unless the bill is super high. And our bill was not high. I’m preeeetyy pissed about it and he’s sweaaaring it’s my pregnancy hormones (I’m 25 weeks). But I don’t think it’s that 🤷🏽‍♀️ he’s cheated in the past so it’s not unlike something he’d do.

What do you think??