Most Helpful Guy
Dont sleep with any of his friends if you can help it. If you both put a real effort into trying to keep it together for a while and both realize it wouldn't work, then things should end and you sho9ld still be ae to maintain a friendship. Dont try to force that friendship immediately either. Also try to avoid bringing a new boyfriends to any shared social events when hanging with friends. Any social event you invite him to or that he may invite you to within the first 6 months should be treated with a degree of respect,
Most Helpful Girl
It wouldn't happen directly after the breakup considering feelings would be hurt and you both would need a chance to move on from your relationship, but maybe after that you two may be able to move on as friends.