I posted yesterday but have much more information.
I have been with my DP for 3 years and we are engaged. He broke up with his ex 8 years ago (together for 6 years). They have seen each other twice in that time and it's because they both attended the same weddings.
I found out that he has been occasionally messaging her - he doesn't see the issue and I said it has to stop.
Happy birthday every year, trying to meet up if they are in the same city, he sent her a photo of our dog when we got it, she sends pics of her dogs.
She was getting married and he sent her a long messaging 'Em, have the most amazing weekend. Knowing your Mum it will be a great party etc.
His mum got ill and she said she'd always be there for him.
She heard we got engaged and messaged.
Nothing weird but I find it weird - they broke up 8 years ago, they aren't friends. Why the need to be in contact?
AIBU?