Love him or leave him?

Question

I have been with my guy for 6 years and we live together with our kids. From day one our relationship has come with a fight. He suffers from anxiety and depression and then layer it on with the fun fact that he and his entire family are insanely selfish humans. They are the type of people who give to you only when they are receiving. We have made it this far because I am a fixer and a giver; to a fault actually. But recently I have been in a place where I don't have the energy or finances to give as I usually do and the result has been his family shutting me out and being very cold. Last night I screamed and cried over this and how taken for granted and abandoned I feel and his response was that this is my fault. No one tells me to give his family as much as I do and I know what I am getting with them so why am I surprised and upset? When I then turned it around and asked why he doesn't see this and then give me more as my partner his response was he does all that he can and he doesn't go above and beyond for anyone not even his family so again- I knew what I signed up for and this is my fault. Am I crazy? I look back and cannot even understand how we made it 6 years! To make matters worse we are all supposed to leave for a family vacation I planned and paid for and while I don't want to take this away from the kids I don't know how I will get through it without losing it or shutting down myself.