the reason E.J. believes that Nicole and Rafe slept together is because he obtained a key to the hotel room from the desk, walked in unannounced, and found Nicole in bed and a shirtless Rafe standing next to the bed (where he was going to sleep on the floor), so it would be a natural assumption for him to believe that they either just had, or were about to have, sex. The thing that does not make sense is the timeline for Nicole to be pregnant with Rafe’s baby and not E.J.’s, and that will NEVER make sense, so E.J.’s demand for a paternity test doesn’t’ seem that questionable to me. Of course, we all know how easy it is to alter a paternity test in Salem, so the most important aspect of this for me is it plants doubt in E.J.’s mind, and gives Nicole the chance to figure out how to fix the paternity test if she decides not to come clean with E.J., and at this point, I don’t think she will. Maybe somewhere down the road, her and E.J. will reunite, but I don’t think it’s going to happen that quickly.