Failed polyamory

I went into with complete vigour thinking this guy was for real. We text with most romantic poetic declarations of love. We met 4 times i 3 months. I asked for more time. He said he'd try. His dedicated text became sporadic till zilch. I broke the rules & become more intense with text & phone calls. Now he stopped completely. I stopped reaching out. I feel abandoned & betrayed, fooled. Yes polyamory was going to be a challenge, l did my research but found he failed the principles, required respect, courtesy & care. I am truly struggling to come to terms with no explanation. How do l move forward. I have thought dying would be a suitable exit.