What would you do?

Right, so at school, there is this guy, let's call him alex, he has a girlfriend, let's call her Laura, and then there is another girl, let's call her hope.
So alex and Laura are in a long distance relationship, Laura doesn't go to our school.  Hope and alex cuddle, kiss, hug and act like they are a couple.  It is really sad cause Laura is such a nice girl!  Alex on the other hand, obviously not.  In health (we are talking about relationships and contraceptives)  we were asked our opinion on "is kissing another person whilst your in a relationship or they are counted as cheating" well hope, who has been kissing a guy who is in a relationship said that yes it is cheating..
What the hell do I do? I feel so sorry for Laura!!  Help please?