How would you feel??

How would you feel if your boyfriends baby mama just recently separated from her spouse and asked your boyfriend when she dropped their daughter off to him on Friday would it be cool if she hung out with them for a little at his apartment (where they used to live together) Never once while she was married tried to do this, and if it’s for the child then why not ask to go to the park or to do something. I’m feeling uncomfortable with it..