I just want to know what do you do when the person who seemed to be supporting you and loved you,…

I just want to know what do you do when the person who seemed to be supporting you and loved you, chooses to walk away from you and your child because he wasnt “ready” after 4 years?

I’m looking for advice.

Theres a long story behind this but I just want to know if theres anyone who can help me cope.