STBexDH and I are recently separated (4months). We're currently still living together as finances don't allow seperate residences until the house is sold and there's some some work which needs finishing before we can do that (get building regs sign off on an extension).
Despite living together we are very much separated - seperate bedrooms, separate finances beyond mortgage and council tax/ bills. We have specific days we are responsible for the children etc. We have completely separate social lives etc.
Despite this, we are very amicable for the sake of the kids and a comfortable living environment.
I went out with work last night and got a bit merry. Whilst out I saw one of STBexDHs best mates that I've always got on with and once worked with. After my work colleagues left we stayed out chatting and drinking. And some how kissing and getting a taxi back to his where we had sex. I definitely consented to the sex, I'm not concerned about that, and we used a condom (he's a total man whore). But what do I do? Do I ask him not to tell exDH? Do I tell exDH?
Im single, he's single, so on one hand it's not an issue. But it also IS an issue and I think exDH but would be unhappy because of who it is. I don't want to make the living arrangements more difficult than they need to be, for the kids more than anything.
What should I do?