Is unconditional love ever attained?

i have very few friends, mainly because i have poor judgement of character.But the end seems to be always about unconditional love and it is always tested to the point i am a total fool. and even if they wanted to remain ,theyhave taken until they can't look me in the face. can any one just accept that love and friendship is unconditional or must they keep testing it? is the ones i pick to befriend already lacking any feeling of it and can't accept it? i think that this might be the root of oll character problems and wonder if anyone knows of any books i can research on it?