H in operating theatre as we speak. i will go and visit because I think it is the right thing to do. How he views it will be seen.
You can let him know you are there because you have a history together, children together and that doesn't erase the past. Tell him you would always like to try and be friends even if you both remarry other people so he should expect you to drop by for a visit if he is in the hospital. You'd do that for any friend.
(Hopefully OW will be uncomfortable with the nice, tactful, non-jealous, supportive, Xwife2B, and turn shrewish).
There is no arriving, ever. It is all a continual becoming.
