Relationship problems 21M 19F

So my gf and I are having some problems. She doesn’t
trust me for something I did two years ago at this point
and she has my passwords to everything. She says I put
no effort into our relationship but she combats
everything I do. One minute she loves me next minute
she doesn’t and she says she has lost feelings for me.
We broke up and had sex and she told my brother she
felt disgusted after and last night we started to get
intimate but I stopped after remembering what she said
and trying to be respectful. She then got mad at me
and slapped me and said hiw she could do it with
anyone but settled for me when we aren’t technically
together. Mind you I had been up since 5am and had
been driving for at least 6hours so I was tired. She
proceeded to slap the taste out of me and told me to
leave. So I did I went in the room with my little brother
to sleep and she called and texted me but my ringer
was off so I didn’t hear it. In the process she posted
another guy deleted our pictures off Snapchat and told
me she wanted to go back to her college. She has been
constantly throwing the idea of her talking to other
guys in my face like saying “the other guys can do it” or
“I could be talking to anyone else
” also verbal abuse
like telling me to off myself and other things. I love her
and want to work it out but it’s really hard.
T