Try to remember who you were before he came into your life. Music helped me remember how carefree & happy I was before a particular relationship. Remember how full of love & laughter you were before they came along. Try to focus on that, do it regularly like every day & before you know it you'll start feeling that way again, i did... Never let anyone make you feel like you need to be less like you to make them happy. It's a journey good luck.
Yes. With my ex. He always made me doubt my worth in such a way that I didn’t see it until the relationship ended. He was co-dependent, deeply suspicious and jealous of everything. I ended up like you, holding grudges, pissed off over the smallest things with him. I have since realised that the way I was acting was really just a reaction to his behaviour.