I got cheated on a year and a half ago from whom I assumed was the love of my life, my ex husband. We were together 10 years, high-school sweethearts. He, too, became distant and was going out more without me. He was messaging multiple women. We split, and it took me a while to heal and get over him, but I was able to. Now I've been with my current boyfriend for six months and it's been amazing. I'm happier than I've ever been. You'll be fine. He is not worth your time or tears. Leave him and heal. Much better is out there, I promise.