It's only forever.

Roman has an incredibly hard time committing to a relationship. (Set Tiffany aside for a few moments, 'kay?)

He is paranoid that people are plotting against him and this includes his relationships. He is traumatized that people have ulterior motives and are hiding their true nature like his parents and their social circle did. (I do touch on this dynamic in my fic.)

He is not an emotional person because he can't let himself be that vulnerable because again, what if someone betrays him? His own parents neglected him so why would he be open to anyone else? He doesn't want to be committed because it allows him the power to leave when he feels like it. He does not want a polyamorous relationship because it doesn't grant him power over the dynamic which is where he feels most secure.

If you're in a relationship with him, he WILL see other people and gaslight you. But he always comes back to you because you're stability in his life and that's why he doesn't want you to leave. Also because YOU leaving HIM once again strips him of the upper hand. You leaving solidifies that HE is what's wrong. So he'll love bomb you and manipulate and intimidate you into staying with him.

Roman also has a preference for dating people who fall into the middle/lower class. He's a man who has a taste for a darker side of "love" and he is less likely to end up in the papers or arrested about it if he targets a vulnerable group of people. For this same reason he also targets sex workers as well. He's going to have an American Psycho moment with them. Roman recognizes that certain people will flock to him and they can be easier to coerce or manipulate into doing what he wants. And if they try to speak out against him, he has resources to stop them from doing so or to make them think again.