wildswan16
Of course you should contact him. A text or letter to let him know that you wish him well in his future, are sad that things didn't work out, and you would be happy to see him if he is ever nearby.
That is spot on because it lets him decide.
I am in the same situation, with my daughter in negotiations over a divorce. I am very fond of my SIL but he has moved into a new relationship and I'm not sure if he will want to stay in touch with me. But I will give him the option (as above). I'm sure my daughter wouldn't object as she knows I'm fond of him, and in my case there is a granddaughter. But I would make sure your daughter is okay with it, just in case it really upsets her.



