Love is an event. It happens to a person regardless of whether such feeling is reciprocated or not. No one decides it; it is never a choice and never planned. It conquers one’s heart like a tsunami coming to engulf the whole beach mercilessly--- without a clue and unexpected.
Unconditional love is a feeling one endures for the love of someone who is not obliged to return the love regardless of any situation. You love without question, without expectations and sometimes in secret.
A relationship is anchored on love. It involves two people who mutually decide on working out an arrangement that is beneficial to both. It is a deal, an agreement, a contract that is sealed by love and respect towards each other.