TMI Vaginal tear

Why does my vagina keep tearing? It is at the opening of my vagina and it seems to never heal. My ob hasn't said anything about it during my pap or any of my other prenatal checkups. It's made my sex drive with my husband go down because I'm afraid. When it does, it hurts to pee or even sit comfortably. I'm at a loss. I've given it time to heal, cleaned it and all. I don't know what to do anymore.