I’ve never liked the saying “forgive and forget,” like… no.
If somebody’s done something shitty to me in the past, there’s a higher probability of them doing it again than there is of anybody else, even if that person says they’ve changed. It’s an unusually high probability, so I’m going to want to remember that it happened in order to be prepared and mindful of it potentially happening again.
There’s another saying, and this time it’s appropriate: “those who ignore history are bound to repeat it,” or something along those lines.
Forgive if you want to. Don’t if you don’t want to.
But never forget.