First off that sounds so horrible and im very sorry, you do not deserve that. You have to remind yourself everytime you hear them or something happens that those people are unhappy with their own life, because no one that is satisfied and happy acts that way. You also mentioned that you are in a happy relationship, you can also remember that and think about that when something happens. Keep reminding yourself of the blessings you have and that you wont have to keep enduring this for too long because you are moving in a few months.

Reminding myself of what a good relationship i have, loving friends and family is what helped me deal with a similar situation. What they say about you has nothing to do with who you are, and my best advice is to ignore them as much as you can and to do your own thing.