New Guy VS. Ex

So Girls I Been Talking to this guy for a month already, meet him on Facebook he lives in New Jersey and I live in misssissippi.  We talk everyday since day one he always send me good morning text, he knows a couple stuff about me, Sane to him I Know some stuff about him, basacally we talk like biyfriend/girlfRiends Anyways yesterday I saw my ex, which to be it wasn't a suprise anymore you know that feeling when you see your ex and don't feel nothing well that's me! Well we accidentally had a quickie 😬🙈🙊 but I feel bad bc is that considered cheating on the other guy I'm talking too? Or was it my fault.
P.s my ex found out who I'm talking to so hopefully his dumb ass self don't tell him!