You don’t know me, but I’ve been married for awhile, and the fact that he was willing to give up after one fight might actually be a blessing in disguise. At least he showed you who he is in the beginning, instead of you investing years and years into the marriage. He was never going to have your back and support you. I have mother-in-law troubles too but the difference is my husband always has my back; the family you make together takes priority over the family you came from.
I’m so sorry that his is how it ended up, but you’re not a disappointment. If anything he is! He disappointed you by being unwilling to put any effort into your marriage and expecting you to do all the compromising and sacrificing!
Keep hugging those doggies!