Puppy and I had been telling you repeatedly for months last year that your wife was having an affair, there would be no reason for her to move into her own place out of the family home just to "find herself".
You probably knew all along, your gut instinct was telling you this all along but you didn't want to listen to it, you wanted to buy her dinner, take her on vacations, allow her to come into your home and make family dinners to make her feel less guilty about her actions.
I feel for you BTM, I wish you had taken our advice back then to really move on with your life.
Don't worry about being dark now, focus instead on being bright, let go of this limbo you are still living in and take advantage of every day.
Don't call her on her birthday, it just shows her you are needy and emotionally dependent on her and I'm sure it makes her uncomfortable, every interaction between you and her at this point isn't healthy. Focus on you and making yourself happy and let her go.