Heartbroken *venting*

Dom💕

My fiance just admitted that he "loves me so much" but doesn't want to be with me anymore. He said that he's not happy 50% of the time and that's why he's stopped putting any effort into our relationship. I know it's over i could see it in his eyes that the connection between us wasn't there anymore. I could tell his feelings were diminishing right before my eyes. This is just so hard for me... we had plans for our future. We have 3 kids together. I've never loved someone like i love him. He said he's not sorry for feeling the way he does. I'm just completely heartbroken. How can someone who literally just looked me in my eyes yesterday and told me he couldn't survive without me just completely do a 180 and tell me he's lost his feelings for me.