FEM POV: You are neglected by the winx girls and valtor takes advantage of that to make you switch sides.

Scenario summery:

Valtor has been stalking you from the magic orb in cloud tower and has taken interest in you since he met you on solaria. This takes place in season 3 obviously,and you earned your enchantix alone. No one was there to help or to witness it,as the girls were having a sleepover that day. This was one of the memories valtor shows you for you to trust him. Basically he manipulated you in cutting off your other "potential" support so that he can keep you all to himself.