I am losing love for life and the energy to live because of the burdens of family life.?

I live in a family with a brother and a sister along with my parents. Being the 3rd child, I have always felt that my needs have been neglected and not taken care of as done with my siblings. My parents are constantly criticizing me and though they have financially provided for my siblings, they cannot stop talking and complaining about the money they are spending on me whereas I do take care of most of my expenses by taking music classes. Lately, I also got to know that my boyfriend of 4 years has been cheating on me all this while. He seems very apologetic and is willing to do anything to repent and have me back but I cannot stop thinking about what he has done. I feel like my entire world has come crashing down. What do I do?