Do you think it's ok to date while still living with your children's father

Ok so I'm related to someone who is currently going through a separation with their baby mama. Ok so they still live together, even tho they are separated and have 2 children together and the woman not only is still friends with all our family on fb she was just at the family reunion a few months ago so were not very close but were close.. She now is dating a new guy and has completely started acting funny towards the family even though were staying out of the drama but I can't help but feel like how dare her act funny towards us then we can see her tag her new guy on fb and were supposed to be comfortable with that.. not to say how badly it's affecting their children because the way she is going about it..I'm sorry but it's just hurtful to see it thrown in our face too, its like ok we get it your moving on but your still our family members baby momma we still treat you respectfully you could at least return that respect.. I already unfollowed her so I don't have to see it but it's just hurtful how nasty she has always treated my family member but I guess I'll be glad when she is gone out his life and I can completely delete her out mines too.. I'm tired of bonding with shady azz people it's so exhausting..