<human>: Give me a shortened version of the text

We've been dating for ~4 years with gaps in between. Before we got back together (which we are now) there was an incident where I was highly suspicious that truths were not being told. I never got any resolution because obviously they held fast that everything was on the up and up. This wouldn't be an issue also, if it wasn't for the fact that this happened when we were in the middle of patching things up to our current state.

Recently I had the opportunity to glean the truth (read: snooping) and I learned that there was definitely more than what I was led to believe. In the entirety of our relationship, I'd never had reason to believe they could/would lie to me.

The issue herein is that we've been fine for a while now and this snooping was in fact an isolated incident on my behalf. Other than this, everything seemed fine. The reasoning for my snooping was because I had an opportunity to learn more and I find I'd rather know once and for all than not. Now that I know, I'm divided on whether this is something worthy of addressing or something I should let slip into the past. I'm definitely upset that I was lied to so confidently, but I don't know if there's a statute of limitations of sorts on these things in terms of efficacy.

Basically, what would you do in my situation? Would you leave it be? Or would you bring it up and clear the air? 

The other aspect is the breach of trust on my behalf...which then uncovered a breach of trust on theirs.
<bot>: Found out I was lied (regarding a third party) while things were being patched up, a while after the fact. Is it worth addressing?