Have you ever had an ex become extremely promiscuous immediately after breaking up with you?

Especially fucking a lot of guys within your shared social circle. How did you handle it? I know he's not my boyfriend anymore and his sex life is officially none of my business, but I have a wide range of feelings about it. Do I have a right to feel any animosity toward our shared friends? A few of them have immediately hit him up for sex upon finding out about our breakup, and he is only too happy to oblige them. I don't really have the right to be upset about this, right?