I’m so sorry you deserve so much better. Teenagers are assholes and don’t think about how much their actions can affect someone so just ignore their dumbasses. Ask him directly for the necklace back if he refuses start being petty like him and ask his little group of friends why a “straight” guy dated you for three months and kissed you multiple times. Stay safe kiddo I know how hard it can be sometimes dealing with homophobes ❤️