Am i giving him a hard time over nothing??!! His explanation seems to add up ;-(?

Hun, your fighting because of a dating website? It pretty much means the man is desperate for a date. And how long were you together? He probably didn't even use the site when you were together. To admit, your not REALLY unreasonable. I would of been mad too, but not to the point where I'd go and see if he has been on it for the last 2 months or whatever. But this is a reason, you have a reason to be mad at this, instead of arguing, why not you talk it out?