Boyfriend Needs Other Woman

Would you feel a type of way if your man befriends every ex he has had, all my man friends are his ex or some type of sexual relationship he had in the past he recently just got back into close contact with a chick he briefly dated after 3 years of the break off he now decides he wants to re-engage with her and take her out for drinks would you guys feel Comfortable ? Is this disrespectful and I told him how I feel and he is not really considering my feelings and think it’s not a big deal. I decided I wanted to take a few days to myself and just think WHAT should I do help ?