I see no point confronting him. You are divorcing so it makes no difference. He’ll lie anyways

He was love bombing maybe because he was in good spirits as he was courting other woman and she was giving him attention, it made him feel god so he was feeling all happy jolly. I’ve read somewhere that some cheaters act distant but some are actually acting all enamored with their spouses and so much into them because they are in good spirits due to love interest on a side. Sadly some want more intimacy at home because they are excited over someone else. Lots of cheaters don’t act turned off or distant with their spouses when they cheat, it’s often quite the opposite. That’s why it often comes as an ambush.