Finding strength after a poisonous relationship😞

I've recently gotten out of a poisonous relationship and I'm struggling to find myself again. Before I met him I was outgoing and confident in myself and my values. I didn't realize until he ended the relationship how much I had drained myself and my life trying endlessly to make him happy with me. The sick part is that I still miss him terribly and I'm fighting myself everyday not to go crawling back even though I know it will hurt me more in the long run. I need help/advice/anything😞 I feel lost and I don't know how to find myself again