Girlfriend(F24) of two years wants to explore her polyamory. I(M27) am conflicted.

Throwaway account.<br><br>So yesterday my girlfriend came and told me that she wants to explore her polyamory. She said she’s been thinking about it for a while and just wanted to bring it up. She then went on to explain that she wants to try dating people and having sex with them. I was blindsided by all of this and wasn’t able to say much. I told her I’d like time to think and she said that’s fine.<br><br>I’ve been thinking nonstop of what to do. I feel hurt because she only brought this up because of her. I get that people explore their sexuality and it’s normal but I’m hurting because it’s not a conversation we both had. I don’t know what to think of it. I’m leaning more towards the breakup because I’m not sure I wanna be in a relationship with her anymore. I don’t think I can share her with anyone. <br><br>We’ve been together for two years and this was completely unexpected. Don’t know what to do.<br><br>Tl;dr: girlfriend wants to explore polyamory. I(M27) am conflicted and don’t know what to do.