My relationship with my ex ended at Christmas when he literally disappeared, ignored my attempts at contact and immediately went public with a new partner. I've since found out he'd been seeing us both at the same time but she was his first choice, I was just sex.
He was incredibly manipulative, hot and cold, used to lie, gaslight me and always kept me on the outside of his life. He'd criticise then act loving, I never knew where I stood. His new partner is fully involved in his life, he's become dad to her toddler kids, he sees her all the time and she's public.
I keep thinking what was wrong with me for him not to commit to me. He totally messed my head for the 18 months we were 'together' yet I still miss him eight months later and feel so jealous.