I would just say that the thread itself is not doing you any favours @Natalie270 . You get points like "clinging to the edge of the mattress" etc. Think about it with a clear head, every person is different, every person's sense of morality or guilt is different, and they deal with them differently internally, and especially externally. Just because's Sue and Jane's cheating partners sweated a lot before a work trip, it does not mean that some other cheating partner would be the same. There are many variables stemming from how different people are from one another... So please, do take everything with a grain of salt, do not be certain about signs that might not even be there - because right now you are actively searching for these, these could easily deceive you.
I am not saying the husband is faithful, nor do I say that he is cheating. You should be the one who knows him the best, knowing what his behaviour means, and not drawing parallels between other women's cheating partners and your own. That is a dead end.
One thing is for certain, there is no trust. Whether you want to do something with that mistrust is up to you. Embrace it and do investigation to get proof for potential cheating (there are so many ways), or not. Also, with the lack of trust there cannot be a functioning, healthy relationship, so definitely do something..