I tried so hard

We would have been married 5 years this October. My husband told me 2 days ago that he wants out. He told me that we just aren’t communicating right and that we’ve grown apart and he just isn’t feeling the spark between us. He gave me a warning about this a month ago and I tried so hard to show him that I’m willing to put in the effort to keep our relationship going but everything I tried made him more distant. Yesterday, as a last stitch effort I wrote a heartfelt letter to him but the answer is still the same. I guess deep down I knew he wasn’t going to change his answer but i really hoped he would. He told me part of his reasoning for not changing his mind is because it would be a slap in the face to everyone if he goes back on his initial decision and that he pour a ton a time in coming to his initial decision and even how he told me. I’m just heartbroken…