Partner on methadone, suggestions for support re: libido issue?

Hi..

My man is on methadone recovering from a pain med. addiction. For the most part I know how to be supportive and can help him feel better. But, I feel powerless when it comes to the libido issues. Sometimes we are ok, but sometimes he just loses it in the middle of trying to connect. It doesnt change the way I feel about him at all, and although it can be frustrating I can deal, I'm not upset about it when it happens, especially not at him. My usual way of dealing with things would be to reassure that its fine and that there's no rush for him to be better, but last night he said something.. I cant recall exactly what, but it was along the lines of him wanting me to be disappointed. So.. is there anyone who has these issues that can give me any ideas as to how I can deal with this better? Anything that you find helpful when its said/done that I might try? Any things that people say/do to try to help which really make things worse? I'm talking with him about this of course but any input would be appreciated.

I've also.. thought about trying to help him orally rather than having intercourse.. because I have my own issues which mean I have to spend a bit of time getting ready and sometimes I think the delay makes things worse for him. But I don't know if that would be a solution or if the same problem with losing steam would be likely to happen.

So hard sometimes to know how to help but will always do what I can...