A married man promised to marry me, but is openly dating someone else

I've been in a relation with this man who was married for last 8 years, he'd promised me to leave his wife and marry me. Currently he's going through divorce with his wife, but he's started dating a girl 10 yrs younger to him behind my back, as I'm not living in the same city anymore, he's told his circle that we separated 3 yrs back and he'll marry this new girl, he's also telling them that I'm obsessed with with and want to marry him but he's just my good friend supporting me. Over this period he's also taken a significant amount of my savings as he said he can't take money from his family. Right now also he says he's committed to me, he doesn't know I have proof of his new relationship, I'd confronted him on this, he said he's not had any other relationship apart from me and sees the future with me.I'm not sure what I can do here to get my legal right as we never made our relationship public as his wife would've taken action against him.