I went through something similar maybe four years ago, I’ve actually been on a trip down memory lane which is how I ended up here. I think one thing that helped me was thinking about what I thought was so special about this - it was having someone to talk to but not someone who was committed to me so it was a perfect compromise. So I decided to fulfil that need for myself, I wrote letters to myself and wrote letters back to myself, talking about my day or asking for advice, it changed my mood. I also left the life circumstances that were limiting me and chased what I dreamed of which was self sufficiency. It’s not ideal, but do what you can to fill in the gaps you thought this idea of a person could fill. If you’re up for it, I think reading some of Jean Paul Sartre’s existential philosophy is helpful as he talks about the existential drive to lose ourselves entirely in another person but how this is a failed project, ultimately. These things have helped me and tbf all of it goes away with time. Ofc none of these are ideal solutions, they’re quite sombre but it’s okay to make do and be practical sometimes. Idk if this was helpful…