Love relation marriage

I have relation from 8 1/2 years. He is Schedule tribe and i am schedule caste. During the starting months i asked him to marry me. He said complete your studies then we will marry. Then i asked him many time when will we marry its been so many years. He always said we will marry. And i grant him for physical relation with me as he always said he will marry me. Years passed by and then he refused saying his parents are not agreeing for intercaste marriage. Betweek these years i got pregnant twice and somehow he managed to convince me for abortion. He also had relation with two other girls along with me same time. Now he is marrying the other girl (one of those girls). My father died three years ago and gave his consent for marriage before passing away. I went into severe depression for 4-6 months. And today i am suffering same treatment for depression second time. He does not agree to marry me in court marriage and sayd i cant go against parents. So both the ways he is not marrying me. I tried commiting suicide several times because of him. Now he is saying that i am marrying the girl of my caste which will make my parents happy and i will divorce her after six months and marry you. Please suggest me how do i make him marry me. I dont want to file any case against him as it will ruin my family and my image. I want him to marry me somehow. I am not sure but i may be pregnant again this time