How do you get over the grudges?

My SO has been in prison for more than year. I visit him regularly and when we have in-person meeting we always have good time, he calls me every day and stuff, but I've been seeing our relationship with third eye since he's been away.

I often remember the moments he did me wrong, when he was manipulating me and in general, moments when he was pissing me off and I keep getting mad again.

Every time I remember him, I remember that stuff and at the same time I'm feeling peaceful that he's away and can't piss me off again.

But When I talk to him or meet him all those thoughts just disappear.

How do I get over those grudges?
How do you get over the grudges?
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