But you need to ask yourself what will you do either way. You cannot control what he does, but you can change what you do.
This should not become an obsession.Either you snoop and act in accordance to what you find or you forget about it and trust your gut. Dwelling on this will not help you.
What did your coach suggest?
As for others opinions/advice, no one else has to walk in your shoes. You can only do what is right for you.
R 25 years M 14 years S11 & S13 Working on it alone since Oct 2014 M in trouble a lot earlier (~2 years) Feb 2016. 1st R chat in a yr. Next R chat Aug'17 Still together