It was an affair in the making that was stopped in the early stages only because he was caught and likely because woman realized he is very much married and got scared to lose her job. He thinks of affair as have sex.

But most affairs aren’t unplanned one night stands. It takes time to get affair partner hooked and interested. It doesn’t happen in one day. He was grooming her by saying sweet nothings and likely telling her he is separating from you or divorcing already