<human>: Condense the text into a few key points

I've just spent the morning throwing up so please bare with me. I found out yesterday my boyfriend I had been seeing for a few months has been leading a double life and seeing another woman behind both of our backs.

I found out via Facebook when I saw a text from her over his shoulder (we were watching a video together on his phone) and then did some stalking of this girl as the excuse he gave me just didn't sit right. The lies and manipulation have gone on even before we got together as a couple and we were friends. He even went as far as faking phone calls, lying about his mum being ill and using his friends as cover up.

I'm typing this knowing I should be glad to say good riddance. However as soon as he found out that both of us knew he went straight to her- telling her she was the one he wanted, he wanted to marry her, and that he only ever loved me as a 'friend' and he felt he couldn't get out from being with me as I was 'crazy' (all rubbish). I now feel the pathetic loser in all of this..as soon as I found out she had taken him back I was sick. Both me and her had spent the last two days comparing lies, messaging back and forth and talking about how pathetic and a twat he was. 

He's not spoken to me at all since I found out. I had a very pathetic phone call from him when he was quiet, said sorry and told me he didn't love me and loved her. I basically told him to go fuck himself and hung up. 

However I'm now at this point of just feeling sad. She has ended up with the man I thought I loved, I know he's crazy and psychotic but he really manipulated me into loving him and being best friends together. I miss him so much even though I know he's just crazy. However I have no idea how to move on or where to go next...I feel like the victim in all of this. Help.
<bot>: boyfriend lived double life, cheated on two girls. We both found out but she has taken him back. I feel pretty pathetic...