Jealousy in men and women are different. When guys are jealous, they see girl they like with guy and think "Damn, maybe she likes him more than me, maybe she'll fall in love and I wont have another chance, maybe she'll leave me", even though girls hang out and flirt with different guys all the time. Therefore it comes from a place of neediness and low self-esteem and is an undesirable trait.
When women see a guy getting with another woman they see that the man is preselected and of highstatus, and thus they become more attracted to him. This is natural for all women. Men don't do this, we don't get jealous and think "oh look how cool and high status that girl is, cause all those guys are flirting with her". This difference is why if you're walking around intimately with a hot babe, every girl that sees you will have a certain degree of jealousy, even if they don't know you. If we see a random girl walking around with a hot guy, we might think she's hot, but will we be jealous? Nope. Jealousy in women explains the guy in the club who is making out with woman after woman.
However, when a girl friendzones you, it's because she considers you an AFC. Seeing you with another girl may make her give you a shot to show her that you're no longer one. So she'll come on up to you, give you some attention, but if you're the same AFC, nothing will change.
If you've actually changed and become and awesome alpha male and it wasn't just some lucky fluke that she saw you hooking up with a hot chick, but in fact was only one of many optiosn you have, then she'll come talk to you and realize how wrong she was all along. The thing is, when you've gotten to that level, you usually don't even want her anymore. Maybe throw her into the fbuddy rotation if she's lucky. This doesn't just apply to girls who have friendzoned you, but to any girl who has rejected you ever. After all, the only difference is that the FZ girls are the ones that like to keep these rejected guys around for attention to stroke their ego. They're more insecure. Trust me, the girls that reject AFCs clearly and directly are doing them a favor by letting them get on with their lives.
So my point is, don't think a girl who friendzoned you will suddenly want to be with you cause she sees you with a hot chick. Her interest might be temporarily heightened, but if you're still the same AFC, it will be just that, temporary.