Advice please
DH and I have been together for 18 years, married for 11 and have three boys together.
I have found out that for the last two weeks he has been messaging his ex on messenger. They had a mutual friend years ago when they were together and this friend has recently been diagnosed with terminal cancer. DH found ex on facebook and messaged her to let her know about their previous friend's diagnosis. DH hasn't actually spoken to this guy in the entire time I've been with him and apparently his ex also lost contact with this guy many many years ago.
They have since been messing on messenger with general chat and sending each other hearts and kisses and remember the good times they had together (DH and ex).
I have screen shot and saved every conversation they've had and saved it in my phone but I haven't confronted him about the messages.
If the roles were reversed and he saw messages between me and an ex he would be sulking, giving me the silent treatment and outright accusing me of doing something.
He has a history of being jealous and if I were to wear a bit of make up, or dress nicely going out he would say things like "oh so who's this new guy you're trying to impress?"
I've put my foot down with this behaviour and we went through months of couples counselling a few years back for other various toxic behaviours.
When I was 9 months pregnant with our last boy I found out he had been messaging and chatting with a girl on PS4. They became PlayStation friends but they had been private messaging with him asking her what she looked like and asking her to send pics of her face, telling her she was beautiful and one time he messaged he to "let's make love not war" when they were playing a game against each other. I immediately confronted him and he couldn't deny it as I had the phone and messages right in his face: his response was it was "only a bit of fun" and apologised:
Fast forward to this situation now and I want advice on what my next move should be. I don't want to go into him angry and emotional as there hasn't been any direct flirting however it is making me uncomfortable.
I don't really see why he had to contact her when both of them haven't even been friends with said person in nearly 20 years.
What would you do?
A, wait it out and see where/if the messages go further
B, tell him I know he's been in contact with her and now find out why the messaging has become common and not even about ill friend anymore
C, get back in contact with my ex and let DH see how he likes it? (I know this sound petty as f**k but it has crossed my mind)
Thank you