Hey, I've been there. I'd say it's only natural. When you've been kept in the dark so long by your spouse, lied to, deceived, treated like you're paranoid, it gets to be too much sometimes. The frustration builds as the denials persist, and when you occasionally get confirmation or evidence that supports what you already have suspected, it overloads your ability to cope. Even small revelations can suddenly precipitate into an explosion of pent up frustration and angst.
So you're a human being like the rest of us. Let him sue you.