I think you know the answer as to "what to believe?
It may take sometime to face the reality of what your ultimate decision may need to be.
I don't know how your financial situation is, you may consider a private investigator to get the hard evidence if that is what you need to see to help you in making any kind of hard decisions.
Good luck,because whatever your decision is it will not be easy. You will need support from your "true" loved ones.
Wishing you a all the best...I really hope it works out the best way possible for you to be completely happy in the long run.
Rating
Duck Walk by: LaDonna
If it looks like a duck
sounds like a duck
walks like a duck
then it is a duck.
Sounds like to me it is staring you right in the face and you do not want to believe it. However, there is that little nag that is saying hello!!....Been there and believe me your intuition is right on the mark.
The lunch thing sounded like he thought he had every right to expect her to have lunch with him. I have guy friends (some are bosses), we go out have a good time but we do not expect the other one to account to the other one.
I'd keep watching her and check up on her and keep your eyes and ears open. May want to have a friend/family member just drive by the house and see if she is home or not since you are out of town alot.