when I came to this forum, I was desperately in love with my ex-boyfriend ( mostly , I was a person who couldn't let go). And I did manifest his good behaviour and I certainly would've manifested the relationship but... maybe, deep down, I knew, it was wrong. 
BUT! with LOA! I have manifested my happy life with my soulmate! so, don't give up! have faith! and trust your inner voice not your ego!
a lot of love!