He has got away with it though
He will still have to be him though, won't he? Imagine living in his head, imagine having the relationships he has. I don't envy him.
You are not 'damaged', you are hurt. And not just by him - he picked on you because he recognised a vulnerability in you.
Can you hang on to 'The best revenge is a life well lived' and do everything in your power to enable your healing and recovery?
Don't even think about future relationships; now is not the time.
Continue seeing your counsellor - or, even better, get referred to see a Clinical Psychologist. Waiting times can be long for this, but the result if often very worth it even if the therapy once you get it takes a while.
RE St John's Wort: it works for mild to moderated depression; there's good evidence that it does. It is a herb that contains a powerful chemical not dissimilar to some medications conventionally used in psychiatry. It does interact with many other meds so do tell your GP or any doctor prescribing something for you that you are taking it (if you decide to take it). It's NOT homeopathy - it's part of herbal medicine and very effective.
Things will get better, it might not feel like it from time to time or all of the time just now, but they will 