Games with jealous LIs are quite rare, but here's some I've found:
Dreamland - MC's friend has a crush on him. There's a scene where you can make out with another girl in front of her (as part of a dare). This obviously makes her extremely jealous.
Game of Hearts - There's a threesome with two LIs that has jealousy points...
Hard to Love - The
old version had some really good jealousy from the MC's sister which was sadly toned down in the remake. There's still some jealousy in the remake, but nowhere near as much as before.
Heart Problems - MC's younger cousin gets jealous that he's been messing around with her sister and attempts to blackmail him into doing the same with her (loli warning).
Lost at Birth - MC's daughter gets jealous of his wife & the woman he's cheating on her with...
Race of Life - MC's FWB is very clingy and one of his students loves to rile her up and make her jealous...
Summer Heat - Jealous childhood friend. At one point she claims that she isn't jealous, but it clearly isn't true.
Twisted Memories - MC's little sister gets jealous of his girlfriend (loli warning).
