What would you do?

well the first thing is don't ever try to control the one you are with don't get jealous of them having friend of the opposite sex tell them ie hey why don't you invite them over for dinner one day and a movie get to know their friends then if something is going on they will act weird around you but never control some one if they are going to cheat they will better to know who they cheated with and catch them sooner and then get rid of them if it is just a friend then by you not being controlling then can not make you jealous...

Of course it's a bad thing. Instead of negotiating it honestly with his girlfriend, he preferred to use one woman to hurt the other. It says many bad things about him. But maybe the worst is that he is telling [i]you[/i] about it. I would ask him, "So...is this what I can expect?"
Boundaries of behavior need to be discussed and negotiated, not played with or used as a weapon.

It seems he has no regard for anyone's feelings. He could just tell Jackie, to grow up and accept that he has other friends. But instead he USES Sofia. She's an item he uses, like a towel or a drinking glass. Just a thing.


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Some guys really hate jealousy. Like it pisses them off. I've never really understood that myself. If it were me, I'd understand where she's coming from and want to prove I'm not cheating... cheating doesn't make it better..

Sounds odd. Friends of oppositesex are fine unless they talk ALL the time.

It seems he doesn't tolerate jealousy?

Yes. It's a bad thing