Cheating and recovery of money

I'm a widow and found someone 5 years ago.He is married but before starting the relationship he promised me that he would divorce his wife afterwards.He promised that he would leave his wife as his marriage was done without his consent and it's been 5 years now.And now as the whole situation has come up to the wife she is blaming me for the whole situation after all his husband was the one who came to me and he is refusing to say and also he took a large amount of money from me. It's my mistake I trusted him and lended the money. He is refusing to give my money back as well as he is refusing to do so as he promised and he had a relationship with me for 5 years what should I do?