Sooo.. I'm going to try to make this as succinct as possible.

When my guy and I started dating (like five years ago) his brother went a little overboard with his opinions of me. He told my SO that I was holding him back, and that at the young age of 23 he should be "keeping his options open" and travelling the world (never mind the fact that he and I travel as often as our expenses allow us, and go camping frequently). His opinion is fine, but he took it too far in the fact that he started lying about me to my SO's parents and sister, trying to poison my name. His brother is the firstborn and seen as the golden child, so for a long time I wasn't their favorite person.

Three years into our relationship his brother wrote me this long letter apologizing, saying he wasn't happy with his own life and took it out on me and my guy. I took it at face value, gave the dude a hug, and everything's been cool (as far as I know) since then. Mind you even before this happened I went to his family's house all of the time with him, and to my face everything seemed normal.

Well, flash forward to now, about 1.5 years later, we're renters at my SO's parents' rent house (we don't live with his parents, they have a separate rent house across town) and his brother said, "I'm coming over to measure some stuff in the attic. Be there in an hour."

A. Knowing how I feel about last minute "guests" and B. That I was sick as shit, my SO asked him to come tomorrow instead, so he would be home and they could chill and have breakfast.

Well, it went from zero to sixty with that one text. I've seen the conversation and his brother said that I'm the most sickly person he's ever met and that I'm so unlikeable he can't believe he exposes his friends to me and that he'd never make his friends hang out with someone so shitty, and that my guy needs to look inward and think about what he really wants.

So, I guess my question is like.. How cordial should I be with this guy? I've already forgiven him once, and it truly is unprovoked. Like he and I have never had any sort of run ins.

If I thought his brother was sincere in his concern, that would be one thing, but it comes off more like a petulant child trying to get their way. Like if he was really concerned he wouldn't include so many slights on me and be so downright mean, know what I'm saying?

Anyway, sorry this is so long. Thanks for reading.