I don't know anymore

lately I've been feeling down well it's been a while since I've been feeling like this but it has gotten worst I don't feel myself I quit my job I'm 20 and not going to school my mom moved and I am now living with my bf I've been with him since Jr high I love him but our relationship has been getting worst to the point that I just want to leave and never look back but I think about it and I wouldn't be able to do that I feel like it's my attitude and how I'm feeling depressed and can't find myself and I also found out something about him that has affected our relationship and how it still is I honestly don't know what to do its affecting us ... Any advice?