Confused .. Don't know what to do

Ok so me & my bf of 5 months got together from a mutal friend that is kinda more of his good friend an is a girl, me & her had a falling out an me an him have got in quite a bit of figts about her. So this weekend me & him got in a huge fight an he started texting her telling her the situation an she obviously was dogging me cause he sent me the message ment for her an it was really hurtful & when I confronted him about it he pretty much kept ignoring it an saying he wasn't talking to her but the things he said only the 3 of us know? So confused on what to do i just feel like we can't move on from it because it was so personal & hurtful