Why people always have to go to the extremes... Jeremy is not exactly the dominant type like Axel, but he is also no pussy. He strings Louise along cause she is convenient to have. He lies cause he rather not lose some easy chick he can use whenever he needs to get his dick wet.
And your claim on Jeremy simping for Ivy is nonsense. He has a bit of a crush and he is trying some things that any normal confident guy would try. If you think what he is doing is enough to be considered a "simp" I have to inform you that would put almost every guy who actually manages to fuck girls in the "simp category". The exceptions being the absurdly rich or absurdly handsome guys.
It's not an extreme. Jeremy is not dominant type at all. Just look at any of his interaction with pretty much anyone in the game.
When Lena sucks his dick at the after-party (and the whole situation in general) he is very passive in the whole thing- doubtful about how his "Girlfriend" will react and reluctant to do it as Lena is "Ian's girl". Not to mention that pretty much every sex scene he has with Lena, it's her that is taking the charge:
- she insist to suck his cock at the after-party
- she sneaks into Louis bedroom to fuck Jeremy
- and she takes the lead in the threesome).
Then there is the whole Ivy situation where she is very obviously toying with him. She knows Jeremy likes to sleep around and she knows he wants to sleep with her which gives her the sense of power over him, much like what her character is all about as seen in her interactions with Ian.
Even with Allison and that whole thing, Jeremy is still not very dominant. During the threesome, the most dominant he can be is to "take charge" of the whole thing and start having sex with Allison without Ian if Ian can't get his dick up.