I feel severely defeated. Any good advice?

One of my really good friends likes my ex and on top of that, he told her something serious that was supposed to be kept between the two of us. He said he didn't want to keep anymore secrets, but I thought our friendship would be enough to stop him from revealing the secret to my ex. I trusted him and gave him information which resulted him in liking my ex. I told him all this stuff because I wanted him to be aware and cautious, not to like her. Now my ex knows the major secret and I'm 100 percent positive she won't speak to me anymore. My friend betrayed our trust and keeps on acting like it wasn't his fault. Now I feel like a criminal who has been trapped into a corner by the police with no way out. What should I do? I feel just done with myself, with life, with everything.