Good riddens!
Count your blessings son. She isn't ready for a relationship. Relationships mean sharing: frineds, time, bars all included. Yes girls night/ boys night are granted but to refuse to go out with your partner and friends is a bit over the top. S
She doesn't want to be exclusive and tied down. She wants it all the love and comfort of you but the freedom of singlehood. There is no such thing (unless your in a open relationship.)