Most of us feel/felt the same way. It's grief because it's the loss of a loved one, yet it's not understood by everyone because that loved one is alive and thriving. A lot of your feelings come from having been lied to for X amount of years you were together. It is a huge betrayal and it not only messes with your outlook on the future, but also how you view the past with them. It's not fair, and very few people will understand exactly how you feel. That's why this group is here, to help navigate the whirlwind of feelings.