Of course it has Trusting. She should look older. Um, like maybe in her 40's or so right? Sounds like she didn't get that right though. LOL.
The thing is, she can't be comfortable with him. She knows what he did right? It's not a natural fit, so deep down she won't be comfortable especially when facing what he left - you and the kids. She "knows" she is not the kids mom, but likely doesn't know where to fit. And she knows he left a long term marriage/relationship - he may do it again to her. She doesn't fully have him, in other words, and likely knows that at some level.
You're right to not let it worry you. You are right to not let him get to you. And regardless of the reasons he did what he did, you do need to protect yourself don't you think? He can still hurt you and may.
For me personally, I do not want to be in any kind of relationship with anyone that I cannot express my opinion or view openly. I was married for 20 years + dated for 3. I know what you mean about how you are still connected in some ways. But I don't see how I would want to let myself be hurt by anyone that doesn't care about my feelings.
Try to keep some boundaries. He is the father of your kids, so you will have to deal with him. Making it pleasant is the best way if you can. That balance is needed and if or whether or not he is trying to get your attention is something you'll have to wait to see. I don't think that's it, but you still want a pleasant interaction so keep being kind and considerate and look for the opportunities to set your boundaries. To me, that's a healthy approach to any relationship.
My $0.04 worth anyway.
AJ
"Our lives begin to end the day we become silent about things that matter" MLK Put the glass down... "Yesterday I was clever so I wanted to change the world Today I am wise, so I am changing myself."