Should i be friends with her again or not?

see what happen was, i was friends with this girl since 8th grade were best friends.during 9th grade we kind of wasnt that close but we were close. then i start hearing stuff like she dating my ex. so i asked her and she denied it.then she finally told the truth. we got in a huge and alot of stuff.. so im wondering should i still be friends with her,work it out, or just eff everything