@lisa1471,
I think "mm" means might mean "married man," like "dw" means "dear wife."
In that case, she's having an affair with a married man, let's call him Martin.
So, Martin's wife, Sally, has looked at Lisa a couple of times and rolled her eyes. Martin and Lisa's fling has been going on for two years. Lisa knows that Sally doesn't know that Lisa and Martin are sleeping together, but is it possible that Martin is telling Sally things like Lisa wants him or something?
If that's the case Sally just thinks that Lisa wants Martin but doesn't know that Martin is already schtupping her (i.e. wants her back, and is acting on it).
What could Martin be telling Sally? Will Lisa and Martin's affair come out because Martin has also told a neutral male friend about the affair? What do we think?
OK, that's my translation. As to advice....
I think it's more likely that Sally (mm's wife) has gotten wind of something going on but isn't sure exactly what. It might be more convenient for her to imagine that you're the aggressor. I kind of doubt that Martin (mm) has said anything, but who knows.
Meanwhile, if there is another person who knows and who is constantly throwing hints about that, I think the secrecy of your affair is not going to last long.