And it is also really common to "fall back" for them. Personally, I haven't really had the issue, because I like my relationship status enough to not "fall back" for someone. It's easy to fall all over for an ex, though. Very normal, especially if you're still friends and there may have been left over feelings. Once again, no big deal -- It happens all the time.
Sometimes "falling back" for exes is even a good thing, because you've already dated and know what to expect.
Attention: NOTHING on this site may be reproduced in any fashion whatsoever without explicit consent (in writing) of the owner of said material, unless otherwise stated on the page where the content originated. Search engines are free to index and cache our content. Users who post their account names or personal information in their questions have no expectation of privacy beyond that point for anything they disclose. Questions are otherwise considered anonymous to the general public.