I know how much this hurts. But, your instincts told you something was up. It's good to know you have accurate instincts. Trust them. They are there to protect you and now you know the truth. You can deal with the truth. It's all the secrets and "not knowing for sure" that will drive you crazy. The truth always rises to the surface.
Also, "Madly in Love" for a person in the midst of a mid-life crisis is very different from what you and I think of when we hear "madly in love." He is looking for a drug or a fix, not a healthy relationship where you build a life together.
"You know, it's times like these when I realize what a superhero I am." Tony Stark/Iron Man
“Focus on what you can do, then do it with all your heart.” Lois Wilson