Unhappy

Has anyone every needs so unhappy in a relationship but just can’t leave? I have been with my so for 6 years, live together, have a 1.5 year old. We aren’t married. Lately I have been very unhappy, crying and all. But no matter how I feel I can’t leave. I guess I just love him and having a kid with him makes it hard for me. Not sure what to do but I just don’t want to make a choice that I am going to regret later 😢