<human>: After a short period of handing out together, we couldn't keep our hands of each other. It was fun, intense and I really believed that we may had something good. We dated for 7 months. I went away for a business trip which lasted 1 week, when I got back I went out with him and he just asked me to be friends. Just like that, no reason at all. The guy that a week before told me how he felt good in this relationship now wanted out and started crying saying how sorry he was. Heartbroken and powerless I left, few days passed and he started texting me,  as we were best friends. He insisted on hanging out while I ignored him, slowly but surely bottling the anger and sadness in me. Before I knew I overexercised myself trying not to think of how much it hurt me and trying not to think of him. I didn't feel good and when I went to the doctor they found out that I had a heart condition which was actually there from my birth, but with the extreme exercises it came to light. 
He somehow found out and demanded to see me, when I finally agreed to that (God knows why I said yes) he started sending me this awful texts claiming that I was faking the entire thing, only to get back to him.

Two years later, we are with different people, but he goes around and tells other people that I am a sick person, faking a heart condition to this day.  I have a boyfriend who I love very much. However, I feel so much damaged after that relationship and it makes me doubt myself in all my current relationship decisions. It still hurts me, and I feel like I project my insecurities to my boyfriend. I don't know what to do. I just keep it to myself...

Give me the gist of the text in a nutshell
<bot>: ex boyfriend breaks up with me, finds out I have a heart condition and spins it to his benefit. I am doubting myself in every relationship after that "incident". How do I end this?