How to possibly end a long term relationship

I've been with my man 7 years we have a 13 month old together. I've been really unhappy for awhile now it seems like all we does is fight over stupid stuff like fighting over fighting. When he ask me why I'm still with him i tell him its cuz I love him I do love him although I'm not in love with him. We have great times together n he loves his daughter. But I've been thinking of taking a break for myself so I can find me and figure out if I'm really the cause of all the fights and really doing the wrong. I'm lost I dont know who I am anymore. I feel like I will be happy single n a single mom mostly am anyways I'm the main caretaker of her. My question is how do I tell him I need space I dont want to hurt him even though it will but I dont want to hurt myself by staying together. But I also want us to be a family for my daughters sake because we didnt have that life growing up. Do I just break through .y fear n tell him or what I need help. My soul is lost