Because he's not into you, and it's okay. I bet there are a lot of guys you are not interested in. Meet other guys by meeting new people, maybe you will find that special one, with whom you will have a great communication and mutual attraction.

You can have both: Just know how to manage your life wisely.

First of all - DON'T stay away from carbs. That's an unhealthy diet that might damage your system. Balanced diet with lots of vegetables, whole grains, and non-deep-fried cooking will help you losing weight and keep you healthy. Never go for fast solutions, if you want a healthy and happy life.