How Will U Feel U If Fall In Love With Someone Unlovable

How will u feel if u fall in love with someone unlovable for u, i mean someone that u r not suppose to fall for, like a friend of mine, he mistaken fall for a lady, who happens to be his best friend girl friend, when he discovered that the lady was his best friend girl friend, he tried as much as possible to forget about her but the feelings keeps get deep and deeper each time he saw the lady. If u r in any situation like this what will u do?

move on and find ursef someone lovable