I ended my 5 year relationship on Sunday, having not been able to get over breaches of trust at the start of our relationship (I overlapped with his previous GF for 3 months with no idea, he slept with someone else a month into our relationship, and then lied about it all, twice). We stupidly got back together at the point of finding all this out a year into our relationship - I blamed my own "trust issues" from a previous relationship and crappy family dynamics rather than apportioning the blame towards him that he had cheated and lied and I deserve better.
Anyway, fast forward 4 years and we've split up again. But he knows exactly which buttons to press to make me feel stupidly guilty again and as though it's all my fault, saying that I am "not trying hard enough" (exactly what my ExH said to me when we broke up) and adamant that he is a different person now, all that behaviour is in the past, I'm judging him on a past version of himself that he isn't now, etc etc.
My exH was a massive gaslighter, and I ended up believing so much of what he said and lost my ability to believe my own thoughts to be true. And it feels as though the same is happening here - I'm being told all this stuff that he is a good person etc (and he has been, at times) and I'm doubting my own beliefs again.
Please give me a kick up the bum and tell me to get a grip.