Doubting

So I remember learning about manifestation when I was younger after my mom bought the movie 'The Secret'. I thought the concept of using your thoughts to create your dreams was interesting and as I grew older, my belief in manifestation came and went. As I reflect back on specific experiences I do feel as though I manifested them into my life.

I had never heard about manifesting SP's before until a few months ago after going through a breakup. I sort of became hung up on that idea and in the last month or so I just decided to give up and let it go because it felt emotionally exhausting and I grew wary of the idea I was trying to manifest someone back who had chosen to go their own way. After this experience my perception on manifestation changed and I guess I'm kind of doubting it works. I'm not in a place where I want to manifest an SP anymore but I would like to work on my self-concept and manifest a relationship, but I guess I have doubts. Any advice?