<human>: Quick background: my bf and I have been together for 3.5 years (living together for 2) and before we started dating, we were best friends for 12 years.  And legit best friends, no friends with benefits; we knew everything about each other and never felt something till we did.

He came home drunk last night and handed me his phone to charge and when I plugged it in, I saw a text with his ex's name and curiosity killed this cat (I'll admit it) and clicked on it.  It was from 3 years ago after 4 months of dating so not sure why he saved it or why this particular text appeared, but there it was - she had asked about me and he said we weren't dating, just talking and that it was weird/complicated.  She proceeded to say she loved him and always regrets not holding on to which he said, he loved her always (as a friend) and that he hopes they always stay connected but that he too thinks of "what if".  

I'll admit, that is the last of their texts, nothing since.  But it irked me, BIG TIME.  We kept our first months private to not open ourselves up to criticism since we were best friends first and two weeks after that text, we went public.  I think what hurts more is that, I am very sensitive when it comes to texts and he knows it.  The last 3 bfs I have had, have cheated on me whether physically or emotionally and each time, I found out by their texts (I used to snoop not gonna lie, never with this BF though).

We are saving for a condo and a wedding so my rational side says to move on, get over it - that we are together and nothing happened especially since that text.  That what matters is us and what we have built but again, my heart hurts and I know its cause of my past experience.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Have never doubted BF before. Found messages between him and a girl from 3 years ago, I want to know how to fight my instinct to be upset - how do I get over this?