I've given up challenging DP on whether his (IMO) suspicious behaviour is because he's cheating. He's either a wrongly accused man, or he's lying through his teeth. Either way it was getting me nowhere so I decided to do some snooping instead.
Only it's all gone wrong, I feel like such an idiot. 
I tried to log into his bank account. But I got the password wrong (or he's changed it) and now it says account suspended!
Shit!
Is this temporary or will it still be suspended when he tries to log back into it?
FWIW I also bought a card reader but that didn't work
.
I'm not willing to confront him (again) without some actual evidence this time - but perhaps this has forced the issue and I'll have to.
I'm at a loss - I don't know what to do.