Is it considered a rebound if girlfriend left me for someone she just met?

Moeconfused
Long term girlfriend we were eachother first loves and serious relationship 4yrs, we've had break ups in past but always came back. Now right after slying across country to visit her and she asked when i would propose to her bc she feels times running out, she's 26 i said i need to finish med school first., anyway she left me 2 days later for a guy she just met on vacation and says their in "love" already and sees a more steady future with him and he moved to her state already so their both moving extremely fast which confuses me. I know i couldn't see her the same way anymore, but would this be considered a rebound?
Updates
+1 y
she called me three weeks after saying she's not sure she made the right choice, not over me and was just trying to convince herself she was but doesn't see a stable fututre bc of religion and cultural diff which she's said to me few times before
Is it considered a rebound if girlfriend left me for someone she just met?
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