In what scenarios can a second woman file case against the married man

We began our relationship at the workplace, both of us were aware that he was married and had two children but we could not control our attraction. the first time we entered into a physical act was merely out of attraction. but soon our relationship transformed into love and commitment. we became connected like husband and wife. he promised me he would marry me legally but only after the consent of his first wife. his wife got to know about us through our chat messages. she was in great pain. initially, he accepted that he loved me and wanted to spend life with me in front of her, but later due to her continuous resentment, he began lying to her that there was nothing between her and me, on the other hand, he kept telling me things would work out. I had to abort once because he promised we would do the baby after marriage.

he is 43 and I am 30. 

Now after one year, he has abandoned me. I feel stranded, deeply emotionally hurt. I feel used. had he been knowing nothing would work out he should have left me earlier without so much of promises and commitment. what options do I have now to claim for my right? things have transformed into worse conditions for three of us. we are entangled in a love triangle. he loves both of us. Can I blame him for cheating?