Story time!!!

My boyfriend married a woman who was three months pregnant with another man's child. The sperm donor wanted nothing to do with the baby, so my boyfriend raised a beautiful little girl as his own. He loves this little girl above anyone else and is an amazing father. He spent 4 years with his wife while she emotionally manipulated and abused him, and if he tried to leave her she would take the child and not allow him to see her, and because he is not the biological father there's nothing he can do. They are working on getting a divorce now, and he has not seen this little girl since April. Last week his soon to be ex wife texted him saying that he might be able to visit his daughter again if he follows her "rules", though she hasn't actually told him what the rules are, and that he will get a trial run this Sunday. I have all kinds of mixed feelings about this. On one hand since being separated from the little girl he's had pretty severe depression, so seeing her again would be amazing for him, and I would like our baby to know its big sister when it's born, on the other hand I question her motives. Why now? What if she's opening the door to toy with him more. This can not be healthy for the little girl either. I want to just let my boyfriend be happy cause he gets to see his daughter again, but I can't help questioning this. Thoughts?