Lots of context so no drip-feeding!
DH's brother was in our city for work yesterday. DH met him in town for a drink at about 6pm and I joined them an hour later and we all went for a meal.
DH and his brother have a bit of a strained relationship. They very rarely see each other (once every few years at family things) and only speak on the phone a couple of times a year. I've only met BIL about three times.
Random context but this is important: I don't wear a wedding ring, I didn't change my name when we got hitched, I refer to my DH as my "partner" when I'm talking to people.
Anyway, while in the restaurant last night a male ex-colleague walked in. This colleague now lives in Japan and I haven't seen him for about five years. We used to get on really well when we worked together. We spotted each other and he came over. We hugged and kissed (on the cheek) and I introduced DH and BIL briefly. We had a quick chat then he went and sat with the people he was with. As we were leaving, I went over to my ex-colleague, we kissed again and generally said how lovely it was to see each other, we should Skype soon.. yadda yadda
This morning, BIL has text DH saying he thinks DH should "beware" of me having an affair. He said that he noticed I don't wear a wedding ring, last night I introduced DH to my ex-colleague as "my partner" rather than "my husband" and I was too touchy-feely with ex-colleague. Apparently DH should "watch out" for me having an affair.
AIBU to think this it's completely out of order for BIL to text this to DH considering he knows nothing about me or our relationship? What's his game here do you think?
DH hasn't replied yet- he can't think of what to say. How do you reply to something like that?!