leaving an abusive relationship advice

I feel like when i say abusive relationship it is an over exaggeration but everyday i feel like shit about myself like im never gonna be good enough for him. He doesnt aay anything bad or hit me but he treats me like an afterthought like i am nobody to him. He says he cares but never really shows it. I keep telling myself im just being high maintenance and doubting myself but these past couple of days my heart feels like its shriveling up because he doesnt love me the way i want. I want to leave but then i think of how much i will miss him and how isolated i will feel. The constant roller coaster of emotions, the constant confusion, the constant not knowing when he will act like he loves me. Is there anyone who can provide me with some advice. I cant do this anymore.