OH...Lordy...my life exp can relate to what you're going thru. My first sexual relationship, in college...I felt true love. I thought I was pregnant, and he said to me, "I can't help you." I still clung to any attention he gave me, which was mostly abuse. What I realize now...after a lifetime of experiences, is that I should have walked away ...PERIOD, after that. I know how hard it is to let go of an attachment as a result of a sexual encounter. But, first of all, you've mentioned the alcohol-induced behavior, resulting in the sex. Then, you've stated you continue to resort to drinking, thus resulting in "drunk-dialing," and drunk internetting. Let me just tell you...you must STOP looking at his Facebook page. Stop. This just feeds your addiction. You are addicted to the idea of him, and he's a total jerk. I want you to try visualizing yourself free...free of thoughts of this bad man. Practice it like meditation and self-hypnosis. Also, seek counseling.
You (and I) have addiction-prone personalities. I know this (now a grandmother with the benefit of age and unfortunate myriad experiences).
Your choice to have an abortion, however painful, sounds like it was the correct one. Comfort yourself. Do not dwell on this man one moment longer.
PM me if you want to talk.