Why some choose to be single 

Some choose to be single not because they hate love or they don't know how to love,but they got tired of giving out their everything and end up with nothing in the end(as a result of betrayal, cheat, reduction in expression of care etc) they got tired of trusting and loving so much and end up being betrayed and heartbroken, they got fed up of being faithful and committment and end up being hurt,jilt,and emotionally or physically abused.
AND lastly but not the least, they got tired of relying and planning all their present and future in people who only waste their time and play games with their fragile hearts. So, before you always call them ugly names, blame them for being hard hearted on you and for taking long to trust and love you back, always first think of what made them act in such a way, put yourself in their shoes and then try to understand them. They have been through a lot and they have had enough of the pain.
They fear to risk their hearts again. They have love in their hearts but they just need much assurance and to be handled with extra care. If you really love them, you got to understand them, bear with them and prove to them that you are real.