I think your feelings are normal. I went through something similar when a man called me after twenty-five years and professed that he was still in love with me just before I remarried. He'd been important to me at that time of my life, and when we went our separate ways, it was with affection and promises on his part, but I couldn't promise to wait for him and in fact, didn't.
What you do with your feelings is what matters. You have a relationship that works with someone you love. Even though you feel you've grown apart (which ironically, sounds like lack of effort like this OM did to you) there's plenty of reason to focus on your marriage and help it come back together instead of chasing a dream with someone who didn't step up to the plate when he had a chance. You have to decide what this all means to you, but I hope you'll decide in favor of your marriage and the vows you made to it.
What you do with your feelings is what matters. You have a relationship that works with someone you love. Even though you feel you've grown apart (which ironically, sounds like lack of effort like this OM did to you) there's plenty of reason to focus on your marriage and help it come back together instead of chasing a dream with someone who didn't step up to the plate when he had a chance. You have to decide what this all means to you, but I hope you'll decide in favor of your marriage and the vows you made to it.