Do people forever love the person they had children and with?

Being in a relationship with a man who has kids with another woman is a bit tough when the baby mom is constantly annoying us! She’s still desperately in love with him. They have a 2 month old and 17 month old together. I’m not sure if he’s still in love with her back. I kind of think he’s still entertaining her because of the way she’s acting over him. What you ladies think?