LDAP broke up with her SO, I'm too afraid to do so

Hi everyone,

so I got into this adultery biz by mistake. This woman (who is now my LDAP) knew I was taken but still tried her moves on me. I resisted for a bit. Then, she sent a nude. So, I panicked and told her I'm not going to cheat on my SO.

Fast forward a few months. She got herself an SO too, but still would send me messages. When I saw she was taken, I thought it would be ok to chat with her. Then, the nudes started again. This time I really couldn't resist - my relationship with my SO wasn't going that well at the time, and I was thinking of breaking up with her. Things got more and more serious with the LDAP. Then, we finally met, and it was beyond any of my expectations. During the 3 months since we "got together" we've met quite a few times, and the sex is INCREDIBLE.

Anyways, we talked a lot about our emotions, and we both said that we want to break up with our SOs, but that we are too afraid to do so. Then, last week, she suddenly told me she broke up with her SO. No warning beforehand, no nothing.

She told me she's waiting for me to break up with my SO too. But, this is freaking me out. Yes, the relationship with my SO isn't too good. Yes, I cheated on her quite a lot with this LDAP. I know that this is going to sound stupid but, more than I am in love with the LDAP, I feel committed to my SO. Just thinking about breaking up with her turns my stomach.

And this is a bit crazy, because truly the LDAP has everything that I ever wanted in an SO. So, I don't know what to do. Any ideas folks?

EDIT: have to mention that I'm 6 years with my SO, and about 3-4 months with my LDAP (although it has been about 11-12 months since we started talking).