Read the first post. As you can see it's just a jealous husband talking. There is no evidence of anything going on, only what his imagination is telling him. They don't message much, and never really hung out together. They have a good work relationship and it hasn't gone any further than that. If the guy desires her, well that's just the norm with guys.....guys I work with desire me, but no one has ever acted on it ever. If I was single, then that would totally be a different scenario.
Emotional affairs is just like dating but without the sex....they would be meeting up for dinner, drinks and be in constant contact with each other, sending intimate messages....none of that is happening here. He needs to trust his wife period.