Yeah for me personally the answer here is "it depends." A guy may be totally done with some gal and not care one bit what she does with herself afterwards. A guy might actually think that she's better for you than for him, or that she's terrible for him and good riddance. Or he may be on agreeable terms and have a healthy friendship with both of you.

You also need to decide just what kind of 'friends' you are. There's the kind of friends that will kill and do dirty deeds for one another, and there's the kind of friends that just hang out at the same bar together. You have to decide for yourself what you think your 'friend' owes you, and whether his behavior in return is worthy of it. We've all seen posts on this forum where the 'friend' is pretty much just some douchebag that someone has been hanging out with for reasons of social accident.

I once had a 'friend' who seemed like an ok guy, but he was always schmoozing people into being his chauffeur. He was mainly concerned with his own sex life and would cockblock when he'd get the chance. My girlfriend at the time said he tried to sleep with her one night, but she says she declined, which sounded credible because he's always been a bit smarmy and physically I never thought much of him. Even if he actually did ('cuz she had slept with lesser men before myself), in hindsight I'm merely inclined to laugh and I didn't feel threatened at the time. The point is, I eventually recognized the extent to which he was a self-serving douche and I stopped being his manservant. The guy had lost a lot of friends that way, being too self-absorbed.

I've seen a pretty decent friend of mine who had another friend that would just end up doing a lot of selfish stuff. The guy meant well, but it's like he was missing some clues about respecting boundaries, other people's space, other people's food, electricity, clothes, and time, and behaving appropriately in someone else's apartment. This was a whole houseful of bros that mostly smoked pot, played Halo, and had various levels of friendship and aggravation with each other. Eventually my friend sort of cut him loose for awhile. Not permanently but awhile. Really the message was that this friend needed to grow the fuck up about how he interacts with other bros.