Most Helpful Guy
When you are with someone, even if you are not having sex, you develop a soul type bond to them. You are no longer feeling so lonely, and you are literally sharing your life, in various capacities, with another person whom you are free to say that you love.
When that ends, for whatever reason, the loneliness comes rushing back in. It can be overwhelming, and devastating emotionally, even if that was not the intended consequence of breaking up.
Thusly, a person faced the with the emotional vacuum of a breakup, will search for the best course of action, and if they are unwilling to deal with the loneliness, they immediately seek to fill that void with another person.
The problem with that, is that other person is often selected based on desperation, not true compatibility, and that relationship will often fizzle out rather quickly. Why? Because there was never a strong foundation when the "new" mate was selected.
They were chosen based on a quick fix.
It is better to deal with the loneliness, to deeply analyze what went wrong, and to scrutinize your own actions. You will come out wiser, stronger, and better equipped to have a relationship with someone of your (wise) choosing.
Always listen to your instincts...