is it cheating.

i have a boy friend of two yrs. and he lives an hour away from me. and i found out last yr he cheated on me. i for gave him .stupid i know he said the girl meant nothing to him. so this past month i downloaded this app called second number its an app where u can use it as another phone different number and everthing. i text him saying it was the girl he cheated on me with. he tells her that he loves her and misses having sex with her and how they used to have sex and how he wants her to visit him and he thinks Bout her alot . LITTLE DOES HE KNOW ITS A FAKE NUMBER IM PRETENDING TO BE THE GURL HE CHEATED ON ME WITH. WOULD YOU DUMP MY BOYFRIEND. i wanna dump him. leave him with no explaination or tell him about the fake number. plus i think im pregnant not sure yet