Been with DP over 5 years. We had a tricky first 3 years in which he had an EA with OW (someone I actually know by sight, but we are not acquaintances) - he never admitted it and nor did I confront him (I was going through a hard time elsewhere and didn't need the additional stress). I suspect the EA got a bit physical to the point of kissing based on the emails I found on his ipad.
The last 2 years have been good. We both feel more secure in the relationship and are both generally happy with the status quo. Neither of us are interested in marriage, we are happy just being a couple. I can't have children and he is fine with this as he also does not want kids. DP is 38, I am 43.
Last week I was with DP in a restaurant and OW walked by with a man, presumably her DP. I noticed my DP occasionally look over at her when he thought I was preoccupied ordering food etc.
Because of this, I decided to look at his ipad again and I found an email from a few weeks ago from the same OW. It seems as if they hadn't spoken in a while and they ran into each other out of the blue, as he had sent a follow up email to her after running into her thanking her for buying him a pint and that he will return the favour.
I don't know what to think or do. DP has no idea I know anything about the OW.