Julz, Your sitch sounds like mine ... AN OW WHO IS PLAYING GAMES! Welcome to the 'waiting for our H to pick me' club.
So what do you want to do? I agree with TAL, don't go to play the games OW is playing, on the other hand, if you want to go, go. I like spending quality time with my H. It definitely helps in our sitch. If you think the time together would help you, why not?
He did ask you to go. Did you ask him why? He may not be too forthcoming if you do, but it may be a chance to dig into what he's thinking. But maybe he really does want you to go - which is good. Are you interested in reconciling your M? This could be a good weekend to employ some DB techniques. Let your H see what he will be missing! I'd go but play it cool.
So, again, what do you want to do? It's hard to sit by and watch our S continue contact with the OP. Many of us are living with that.