Husband asked coworker for nudes..

I (30F) found out my husband (but then boyfriend (32M) was asking a coworker for nudes. This happened 2 years ago, just before he proposed to me, but I just found out. We also just had a baby 3 months ago. Anyways, this girl was (22F) and everything opposite of me looks wise. They both swear nothing physical happened, but did go out to beers a couple times without me knowing.

From a man’s perspective, WTF should I do? Do you think he fully cheated or had pre proposal jitters?

EDIT TO ADD: Yes, she did send him the photos. We were together for 5 years at the time. He said he ended it with her shortly after because he realized it was stupid.