A moral dilemma..any advice??

So i am 23M i things where good for me until i joined college So when i joined college i met this girl we became best friends and we used to spend lots of time together and i really liked her after one year she became frnds with onther guy and i was cool about it (secretly jealous) but i was okay she talked to me like usual After 1 more year she started avoiding me and i didn't do anything i didn't even ask her y she is avoiding me later found out she got new friends and dosent have time for me I went into a little depression because of her Enter final year i met another girl and we became friends and fell in love and i also became friends with another girl due to our intrest in anime( now i have two priorities) Now this girl my old bestie wants to talk to me all of a sudden she wants to hang out and i found out that this guy whom she was with left her for another girl and wont talk to her Now i can't talk to all 3 of them , i dont have the time i have to study also now what should i do ..should i just ignore her or make adjustments?? And should i give her another chance ? And should i forgive her ?