Yeah, I'd not have felt comfortable either and I'm closer to kourtneys age. I think Kourtney was very effected by her parents divorce, maybe thats why she wanted to go full on with the co parenting stuff. But going on holiday with your ex and his new girlfriend and bonding with her is odd in anyones book, I'm sure. Another potential scenario may have been Kourtney not trusting Scott to parent the kids without her being present. But I think my number 1 theory is Kourtney having attachment issues and she only saw him as a donor not a partner. I think she has a hard time forgiving people and holds a lot of resentment.