Well, Steve is right that he's probably not going to try to outright kamurder you, but that doesn't mean he won't, say, threaten your family, or screw with you in other ways. We probably do need to do something about him; I suspect he's not going to be impressed by that threat and without Crimson on the scene we also don't have a face good enough to con him (I'm about 99% sure he's an Adept at this point).
IMO, our best bet is to tell him that you can't give him the eye because it would be unprofessional (which is true) and it's worth a lot more than that (which is also true); if he makes a better offer maybe you'll get an idea of how much he cares/how much backing he has, too. Then we leave and try to beat him to another source of that information; alternatively, we go after him and try to get that widget he took from Breaker anyways, we just don't actually kill him for it.
Another option: borrow money from elsewhere, pay steve back, then shoot him in the face. By "elsewhere" I mean "the Vory," but you'd undoubtedly wind up with more debt (the Vory has no reason to loan you money without either charging you a hefty chunk of interest on it). Sundance will offer (not in so many words) to put you in touch with a loan shark if you want to do that.