I did that to every faction in New Vegas. I was also loved by nearly every faction in New Vegas (minus Powder Gangers) Heck NV gives you a reset button too, no matter what you did before, like launch a nuke. The stealth skill is a lot of fun. That sounds like any other Bethesda game.
Ok I’ll concede to the flirty dialogue I had forgotten about.
You can date your companions remember. Regardless of sex. It was even known before the game released.
You can become a raid leader and Preston will abandon you. You can join the institute and get disappointed talks from most of your companions and lose two. Same with the Brotherhood.