Love that can not be seen is not love. If someone is always asking and taking from you, where is the love? True love gives without expecting anything in return.
When you learn to love yourself and take good care of you, others will see that you have value and they will come to love you or at least respect you. Stop giving your love to people that are not returning love to you. People can do no more to you than what you allow them to do.
Love is forgiving, no blaming all the time; love is encouraging, no depressing all the time; love is joy, not sad and angry all the time. Evaluate the love you are in. Where is the love?