It seems pretty obvious that there`s a good deal of E.A.S involved here. If she`s Prossie she`s bound to be seeing other punters, but the O.P`s post seems to be implying that she is being unfaithful to him with another bloke. His posting is far more suggestive of the complaint of a Sugar Daddy who`s just discovered that the little sweetie he thought was his private property is cheating with a younger bloke on the side.
I`m a great-granddad, and I have had a procession of `regulars`, all of whom I stuck to exclusively until I get bored, but most of them were prosssies and I didn`t claim, or expect, that they owed me any particular fidelity. However, if I suddenly discovered that any of them was working the `revolving door` appointment system I would have been off like a shot - for good