Hear me out, I'm not massively ok with this and nothing has been agreed but I could do with opinions.
Current situation I have been with DP 10 years married for 1 and a 5 year old son.
Ex has been with his partner for 5 years married for 1 and has a 2 year old daughter.
Now my ex and I were together for about 14months.... 12 years ago. One of those situations were I was obsessed with him but he wasn't really there.... I got over it and he got interested but I wasn't really there then finally we were both in the same page for just over a year but we were very incompatible and decided we were better friends! We remained friends happily with zero lines crossed for 1.5 years before I met my now husband, I was clear we were friends and although he wasn't keen we stayed in touch but ex moved 4/5 hours away so we just kept in touch online.
It fizzled out as things do but when I had my son he sent a lovely message and was in the area with his new girlfriend and wanted to pop in with a gift I happily agreed and they came over for an hour or so. After they left he got in touch and said although she thought I was nice she wasn't massively happily with the idea of exs being friends to this level and he felt bad etc.
We barely spoke again in 5 years, I saw on social media he had a little girl and I sent a message asking for his address to send a gift which I did ( gift for baby and a candle and chocs for mum)
Now to present day.... he got in touch last week to say he is in my city for a work event for 2 days and wants to know if I'll go for dinner and drinks, Without thinking I happily agreed and told my husband again he wasn't thrilled but understands and we have a good relationship. However he's now mentioned he won't he telling his wife as she wouldn't be happy....
Do I go in secret or do I decline on the basis she has to know? I