I know it's hard to let it go but it's better off without them who don't value you in the first place. You don't owe your self respect and your mental peace to anyone. Losing is part of the nature. Be like a tree, and let the dead leaves drop.
We assume what would happen after this, if they can let you off..Find a reason like them. Don't play blame game on youself. If you can't respect yourself, then don't expect this from anyone. Just embrace your own company. You're enough to make yourself happy. We often depend on someone else's for our own fucking happiness. Be someone with whom people want to spend time with not the one who cling on others. Just be the hero of your own story. Don'te let other people write your story. You're more than what you think of yourself. Just take a break from these toxic people around you. Go travel, meet some amazing new people, you'll learn something new, your perspective will change for sure and probably you will find yourself. The moment you'll realise, you're the source of your happiness...you will become fucking Buddha.