bpd girlfriend. undiagnosed

She is always moody, everyday up and down, today she is just picking Fights with me today and swearing and carrying on.. I have been with her for 4 years and itsss soooo draining .. she had lied and cheated and you name it .. she done it. When I wanted to leave many times she never lets me , she gets violent and physically and her eyes turn black. She sometimes hits my walls. She lives in my house!

I swear every weekend we fight bad.. I don't know why but we just do. We never have a good happy weekend .. I never look forward to the weekends anymore.

I'm so over life .. I feel so stuck .. I feel so weak and worthless :( 

She has bi polar too I think.. 

She went out for dinner the other night with friends and all she was worried about was what I was doing .. I layed in bed and watched my series for 3 hours that she was gone .. she came home and said why do u smell like you have purfume on? I said I don't ? I just had a shower? And she put her hands down my pants to see if I was wet .. incase I cheated on her ..

If I get a message on my phone or I'm texting someone or replying to a client she is like who is it , who r u msging.. what they say etc