<human>: Give me the gist of the text in a nutshell

So I just started dating an ex-girlfriend again (I know, first mistake, right?) and for the first few weeks things have gone WAY better than I expected.  

So the other night I was out drinking with some buddies and I got a slightly racy text from my gf about how she was getting ready to go to sleep in our "dirty sex bed".  I of course smiled and my buddies asked what it was, so I showed them, and of course got fist bumped.  

My mistake was telling my gf that I just got fist bumped (I am so dumb, I am really dumb, fo real).  Any way, she got PISSED, and I completely understand.  She has the right be be upset.  That text was for my eyes only and I made it public, so I get it.  I'm not saying that she shouldn't be upset and angry - I think that she should.

Here is the problem.  She is saying now that I have betrayed ALL trust she had in me (I'm a trustworthy guy, and never cheated on her or did anything to betray her trust in the last few weeks, or the last time we dated).  She wouldn't talk to me for 2 days, and now that she is talking to me, she wants to end our relationship based on claims that I'm a terrible human being.  

WTF, Reddit?  Did I really fuck up that bad?  I think I deserved a few days of dealing with an angry gf, tops.  She wants to end everything over this.  I think this girl is crazy and if she is going to overreact this big to something pretty small, I need to get out, and soon (But i REALLY want Reddit's opinion on whether she overreacted or not!).
<bot>: I showed my friends a text my GF sent me, and now she wants to break up with be because of it.  I think she's overreacting.