Why do I always feel useless and unloved after a breakup?

In my opinion its because the other person makes you feel useless and unloved and that results in emotional instability, sadness, negative thoughts, emptiness, irritation and lack of interest in common things and even things that we like to do. But it is normal to feel all of this. What one must understand during this time is not to beg for love and attention. It is important to believe that you deserve and can get better. You must try to stay positive and think positive towards each and everything and when you put the required efforts for making yourself feel better you'll definitely be haapy :)