First of all, girls aren't attracted to men who are desperate to be with them to the point of being incredibly possessive and not allowing her to have someone they truly love. Especially if they have someone they love more. I feel sorry for him, but at the same time... his attitude about this is too much. Getting angry and lashing out at the one she loves will get you nowhere and will just lead you through an endless cycle of hurt and rejection. In your case, she could end up hating you. So please. Just stop. Seriously. It's getting painful to watch.