If a man truly wants to save his marriage he would do anything and everything to fix it right?

So me and my husband have been married for 2 and half years and we have a 6month baby, we had a lot of arguments prior to baby but always fixed it, when I gave birth he helped me with the newborn phase he would wake up some nights and I really appreciated it, when baby was 3 months he stopped helping, he would come home late from work, go out every weekend with his friends, I had postpartum blues and almost got into depression as I’m not used to staying at home and did not have support as my family and friends live in a different country, I felt really alone and would cry half the time, I spoke to him about it several times but he would make promises and would not keep them, in the end I decided to leave and stay with family for a while so that I can get some help, stayed with family for 3 months now, he went quiet and wouldn’t call or check up on us, he stopped providing financially and I had to get into debt to help cover the bills, I got really frustrated and asked for divorce as everything was too much, it’s been 3 months now, he never reached out or apologized, but he claims that he wants another chance and wants this marriage to work, but what I don’t get is he never put in any effort to try make it work, he never texted or called to show he cared. I don’t trust that he can take care of me and my baby anymore as he disappeared when we needed him the most, I am tired of his empty promises, I don’t get how someone can change from helping me out In the beginning then changing totally and being heartless. Am I exaggerating? Are my feelings valid?