My ex is surrounded by support, from the same people who I thought were my best friends.

This is the reason why. Your ex has managed to control the narrative and has manipulated the social atmosphere to ice you out. Emotional abusers are often very good at this. They mamipulate everyone around them.

And they are really good at choosing their abuse victims. They know who they can love bomb, who they can isolate, and who will keep their mouth shut.

I have been there. Watched people I thought were friends just evaporate, choosing their relationship with my ex over me. Realizing they were never my friends, they were "ours", and ij the end they stuck by her, the more openly social and boistrous one.

It's taken a long time, and many different therapists, but I've come to accept my experiences as abuse, as not my fault, and... sometimes... that I am worthy of love, friendship, and happiness.

I have found the books The Body Keeps the Score and Complex PTSD: From Surviving to Thriving (available as audio books), as well as videos on toxic shame and attachment by Heidi Prieb, very helpful.

I know the words feel hollow, because they feel so far the opposite of true, but you are not alone. Many others have been through what you've endured, and have made it out the other side. There are people out there who will, one day, be so very glad to have you in their lives.

Some day, when you're ready -- and much earlier than I did, I implore you -- you should join some activity groups. Take up a recreational sport, join a gaming group, take group acting lessons, join a choir... anything that is a) casual and b) a group activity. Bonus points if it's something you always enjoyed, buy your ex tried to excise from your life. This will help you rebuild your social network, and let you reconnect with yourself.

Physical activity and a healthy diet is also important here. It may be the last thing you want to do, but it actively helps fight all of your worst psychic injuries. Not only is it physiologically good for you, it's psychologicallly good for you. You know that it's good for you; your brain knows it. Doing healthy things means choosing to care about yourself. You need to actively choose yourself at every step of the way. It trains your mind to see yourself as worthy of care.

Oh, and ritually burn things that were hers, or that were shared and tied to your relationship. You don't need them. You don't need her. You're going to be better off without her.