But more importantly, you need to stress that you did not deceive him - you slept with those two guys during the breakup. You had no duty to the boyfriend at that time, so the guilt feelings are not called for and are counterproductive. So he should not be angry at you.

Also, you are conflating two very different things.

Sleeping with guys is not something that should make you feel guilty and dirty. Sleeping with guys is not dirty by itself - it is just one of the ways to spend time together. Why guilt?

Deception (if you were sleeping with these guys behind his back while telling him that you weren't) would qualify as a reason to feel guilty, but you did not deceive him.