I can feel you.
Attracting back an ex is not easy... but its simple.
Dont beat yourself up because you are still hurt. Its normal. Be gentle to yourself and try to work on dissolving your hurt. You dont have to rush things. Give yourself time to heal and grow PRIOR to attracting him back.
SOmething that worked for me is not being TOO focused on that particular relationship.
For me, it drives me insane to visualise too much and being too eager in scripting and doing rs.
For me it is easier to go on with my life and doing meditations. Self love mediations are key.
If you dont like meditating, write down "I love myself. I am worthy. I am important. I am the priority in MY life. I am ENOUGH. I am lovely. I am firstbest."
I suggest, to only send love, do RS or visualise when you feel your own self love.
For me, it was the only way it worked. And it DID work.
By the way, the Universe is you. You attract based on your thoughts feelings and beliefs.Its not an outer force that decides for you what is best for you.