Email from DP to his exDP - am I nuts to feel wobbly?

[UnsureOfOutcome]

Hoping the answer's yes! Have nc'd for this but I'm a longtime poster.

Background: DP and I have been together 3 years, living together with my DD, his DD comes and visits every other weekend. He's on reasonably good terms with his ex; she and DSD (7) live in their former home, which DP owns, and because we live a little way away from them, when he looks after DSD one night in the week, he goes and stays over, and his exDP stays with her parents. I've met her, she's nice, and we've even taken the kids out on trips together as our DC wanted us to know each other.

So today, got home from work and turned on computer; DP had left his email open to an email to his exDP. I looked, know I shouldn't have . It was about arrangements for the week, which day best for him to go round, him suggesting weds so he could put DSD to bed and then they could eat dinner together.

Now I obviously have NO problem at all with them eating dinner together, but he hasn't mentioned it to me, and I'm not sure why not. I'ts left me wondering whether they have dinner together every week and he just hasn't told me, even whether she stays there - my mind is running somewhat wild about it all.

He's given me NO other reason to believe that there's anything still going on with her, is extremely devoted to me and DD, and I think I'm probably just being paranoid, but I'm now going to have to raise it with him I think as I'll just wonder otherwise, and then I'll have to fess up about looking at his mail. Oh dear. Am I totally losing the plot?

This is the second time I've quoted Freud on here today - There's no such thing as an accident.

I am surprised at the responses - I don't think I would mind this. He goes at dinner time and presumably they just have a catch up about their child/lives over a plate of macaroni rather than a candlelit champagne and lobster affair? Just ask him about it and see what he says, hopefully his response will put your mind at rest.

As others have said, if they want to discuss their DD, over a meal once she's in bed makes sense given that he'll be there to see his DD and will probably nornally eat at that time anyway. But not right that he didn't tell you, has this been a regular thing? Will you trust him to be honest?

Have you spoken to him, OP ?

If innocent and one off it's fine. It could well still be innocent, but not as fine if it happens on a weekly basis, in which case he has had 3 years to mention this. I would not be surprised at there being an innocent overlap in the early stages of a split, but after 3 years or more? Really, it's a bit odd to be spending the night there still, especially when now with you.
I did something similar for a while with ex-P, my next BF did not like the situation, but as it was innocent and for me was more about childcare issues, I could see his point and dealt with it. I was glad not to revert back to the situation (despite ex-P seeing the ease of it) when on my own again. It's not my responsibility to make ex-P's life easier by providing a bed for the night. How little way away are you that you he could not see her with you? (90-odd miles in my case)

ps the pair of them may just need a kick to change from you. It may have carried on longer if i'd not had that kick, glad of it, best way really to cut ties in that way. Self-reliance being better than still leaning on an ex's goodwill.