If this guy is making you worry about your mental health then maybe you need a break? Sometimes you need to pull away from someone to make them realise how much they miss you or that you'd leave a void in their lives. Maybe give him a chance to miss you? Make yourself go out and have fun every day, surround yourself with people/things you love to make the days easier. I can feel your hurt by continuing the way you are. But if it's meant to be, it will. Love is a dance; back and forward, forward and back but if the other person keeps pulling back and you're moving forward, it's not a dance, it's a chase. What do you do if you're being chased? You run! Pull back a bit and think if you really want this guy and how to get him. Hope that helps