Girlfriend and I broke up 5 days days ago. Now she has a new boyfriend. We were dating for 15 months...

Anonymous
my girlfriend and I broke up last week and now I found out yesterday that she has a new bf. is this possible? I mean of course it's possible, but can she just be doing this to cope/get over it? I can't see someone seriously dating someone a few days after they break up with their 15 month bf. by the way, we are both college seniors and while I broke up with her our breakup seemed very mutual.

if you were a girl and in this situation she is in how would you look at it? if you broke up with a boyfriend of over a year do you think you could date a guy a few days later? and if not would it just be a coping/rebound thing?

i don't think she was cheating because there were no signs whatsoever. I have never been with a cheater so I'm not sure what to expect really, but I got no hints she was cheating on me.
Updates
+1 y
just one quick update. they met a week before we broke up...so most likely cheating wasn't there... (and no she didn't tell me this)
Girlfriend and I broke up 5 days days ago. Now she has a new boyfriend. We were dating for 15 months...
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