Well, I am the opposite. I am way too trusting of people. Usually it works out, but sometimes I have been for a rude awakening.
You're hypothesis is certainly plausible. I am not poring over the discord and reading between the lines of everything Ace has said in this thread, and I am notoriously bad at mysteries in general, but this seems a reasonable turn of events. Who more than Elaine would be motivated to screw the MC (figuratively)?
Bella and Jolina seem the only other likely options. Either could be the father's affair, and to me Jolina seems to be too mixed up in everything for it to be mere coincidence. Sure, a few other characters like Angel and even Monica or Zarah are theoretically possible, but I haven't seen any backstory leading in that direction, and it would be out of left field, in my opinion, for either of them to be involved.