No lar, I am not knowledgable - we are learning
from one another each new day.
And I never say being single is a sin - I meant IF it was a sin
then people would enter hell, which in the first place isn't a sin
lar. 
Rebound or not I know not of the name, but frankly speaking, in the
case you mentioned above, the phrase is 'Looking for A in B.' Many
a times in life, people haven't settle 'themselves' yet, before
leaping into another relationship. The fear to be alone and to
venture alone is there, which causes them to made a hasty choice.
Looking for A in B, basically alot of people are doing it since
they have their first relationship. Why? Because when you enter
your first relationship, you will gradually understand which
positive aspect you like and which negative aspect you hate. In the
next relationship, you will source potential for some of this
characteristic subconsciously.
Depending on how one sees it - basically, after one failed
relationship that really affect you - I suggest a time to
recuperate before leaping to another relation, if you want to avoid
such issues.
Cheers
