Most Helpful Girl
Spend some time with close friends or family. Try to get your mind off of her. She doesn't sound very trustworthy.
Most Helpful Guy
slight jealousy maybe? then again most if any of her guy friends youd already know about if they were close to her. Random new guys all the time would be a little weird but not uncommon if you're in college and partying and hanging out and meeting new people.
What i think this comes down to is trust and you had this fight because something was off and you didn't fully trust her. If the relationship was fine, you wouldn't be worrying about what she's always up to or who she's hanging out with boy or girl. Youve got your own shit to worry about and own things to do Gotta trust them that theyre not messing around