Is it normal to extremely sad over your exhusband passing away?

Recently my ex husband has passed and I'm taking horrible. I've never felt like this before. Like a part of me is gone. We had a daughter together and give her up for adoption in 2011 when she was 1. So I still very much so have a connection to him. We got divorced only 2 years after getting married at 18. We were very young but very much in love. I was the only person he every loved so that's comforting but I miss him like crazy. I been with my current boyfriend for nearly 2 years and he's amazing but its not the same as it was with my ex nor did I expect it to be. Maybe we,'re just not there yet I don't know. But I'm so beyond grief stricken I'm lost. A part of me always thought once he got his life together we'd be together again. Even if was just a little hope it was possible and to have it completely taken away seems like too much to bare. Letting go of him once almost destroyed me. It was horrible I can't recall most of it but the parts I do still hurt. I don't think I can do it twice and this time forever. I never truly let him go he had a part of my heart and it will always be his and now he's taken it with him.