So let me get this straight: You've practiced LOA for two years and you're calling bullshit because a guy you barely know suddenly ghosted you? What have you tried to manifest in the two years? What have you done to better yourself? Are you solely working on attracting people or are you working on yourself?
I'm assuming you're only working on a relationship or else you wouldn't be so pissed about "losing" someone you've known for two weeks. Since you didn't include any details other than this, I assume you haven't worked on anything to better your own life other than relying on a relationship to make you feel complete. There's so much more to LOA than getting some random guy to want you. I find it very hard to believe that anyone who has spent two years focusing on self-love, happiness, finding ways to better their own life, etc. has gotten NOTHING to show for it... unless you're too lazy to love yourself and are depending on someone else to do it for you. By the tone and anger of your post, it's quite obvious that's you're not in a great place of self-love.
Explanation? You want strangers to explain it? Okay. I'll give it a whirl... you don't love yourself and people get the vibe that you're an energy sucker. I'm not doing extensive research to see what else you've tried to attract in two years, but based on this post and this one alone, that'd be my guess.