Girl, go and have strength for your "mother" - you can call her and cuss her out, find out where she works and embarrass the shit out of her, find out where she has fun and publicly humiliate her. STAND UP!!
All that WORK you put into trying to split up a very happy relationship after just seeing ONE kiss and deeming it abnormal, YOU COULD HAVE DIRECTED IT TO YOUR SHIT OF A MOTHER!
Kmft, girl go away.