<human>: We're both 23 and my ex-girlfriend and I were together for 2 1/2 years and last Monday she dumped me. She said she's grown up a lot over the last 2 1/2 years and said she decided that what I was working towards (college degree and job after college) wasn't what she wanted and she wasn't happy. It really seemed to come out of the blue so I took it fairly hard. Yesterday, not even a week and a half later after she dumped me, she's already dating this guy she used to know back in high school or middle school or something. This is by far the longest relationship I ever had, I still don't really know what to do with myself without her and she's already with this other guy. How do I deal with these emotions? I feel like I was dumped twice and betrayed.

Summarize the given text in a few sentences.
<bot>: Girlfriend of 2.5 years dumps me, says she's not happy and isn't what she wants, is dating another guy now not even 2 weeks later, not sure how to cope with my feelings