What are the odds &should I tell her..

Okay so while I was pregnant and working a guy came into my work and was hitting on me. I told him I wasn't interested and he just kept asking for my number even after he saw I was very pregnant and also mentioned he had a son too!

With that said I recently came back to work and just got a new coworker. She's super nice and has an 18 month old and we were talking showing pictures and I saw one of her baby and the baby's father and guess who it is the guy who was hitting on me. And they are together from what I hear from her.

yet little does she know he was out trying to get me to go out with him. Do I tell her..