Been diagnosed for two years now. Am 20 years old. Been recently dating a 24 year old. He is wonderful, a lovely man. I adore him, he loves me and cherishes me. He is also a brilliant partner for me and I care about him immensely.
In the beginning of us meeting, he was unavailable, cancelling constantly, was completely passive towards me. This made me want him uncontrollably. I had no desire for anyone else (which is so unlike myself). Finally, a switch changed within him, and he began to "fall in love" with me, as he puts it. Now I am the apple of his eye, and I have lost so much interest in him. I have a wondering eye now and am incredibly frustrated with this.
Previous to this guy, I was speaking to another man that I really liked. However, he told me he was still in love with his ex-girlfriend and had slowly cut me off out of no interest in being involved anything more than sexually with me. Lately I have been thinking about him. This past weekend, I was very intoxicated, and I ended up meeting up with him and having sex with him. Now I cannot stop thinking about him. 
The unfortunate part of this is that I lack a lot of guilt with my actions. I know I should feel very guilty, but I don't. It was something I wanted to do, and I fulfilled that. Which I am understanding now that the concept of 'hedonism' is something that comes with having BPD. Complete and utter pleasure-seeking behavior, even if it means you are harming those you love. I have spoken to a friend who has also been diagnosed with BPD that also has had experience with this.

How do you all deal with (or have conquered) the concept of, 'this is a good person and I should be with this person' versus 'this is someone that does not want me, therefore I want him'.

I am looking forward to hearing all of your stories, thank you all in advance.