My gf of 2 years shocked me yesterday night. She says she's not able to enjoying going out at night with her Uni friends as she can't do anything and experience things.

She said maybe we should go to being casual or open relationship. I'm in shock at moment and don't know how to respond. I've wasted so much money in her and gifts. I've gave her all the attention in the world. This is my first ever relationship and I committed everything. I never even talked to any other girl. I stayed loyal. Now she wants to experience life. Why are women so cruel?

Please help any advice is welcome, I'm very bund rabble and I don't know what I'm gonna do.

Tl,dr: GF of 2 years feels like she's missing out university experience and wand to go casual. What to do?