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

I dated an amazing girl for 4 years. We talked about marriage and kids and all that lovey dovey stuff.  We ended things in early February (I was treating it as a actual honest to god 'break' where I was getting counseling for commitment issues).  She apparently treated it as a breakup where she started sleeping with her married ex-bf.

I found out (not from her) that in late march she had an abortion procedure at a local women's health center.  She told me that she hadn't started sleeping with her ex until early April. If I believe she's telling me the truth then obviously it was mine that was terminated.  

However, my sisters and friends all feel deep down that it was her ex's because that would explain so much of the situation and why she never came to me for support or informed me it was mine.

It's been a solid 2 weeks since I've had NC with her and I'm doing well.  However, not knowing if it was mine or the ex's is tearing me up inside.

If it was the ex's then she cheated on me while we were still in our relationship.  If it was mine then I'd ask her why she didn't come to me for support or at least let me know.

I have put all of the blame of the relationship ending on me for having commitment issues and it has been incredibly difficult to accept.  If I found out she had cheated on me it would make ending things a lot easier and how things ended up would make a lot more sense leading to complete closure.

If it was mine I would just want to ask her why she didn't at least inform me (she lived one floor below me and we were still "talking" trying to work things out).

There is also the third option which is she didn't know who's it was. This means she still cheated on me and I could cut myself some slack.
<bot>: Do I break two weeks NC with ex to get the answers I seek regarding whether it was my or her ex's child she terminated?