Is he not wanting to see me anymore?!! SO SCARED....?

I always question why an ex enters into the present if someone is in a healthy relationship. You are right to feel uneasy about the ex. If he is treating you differently, I would think it's because he may be involved again with her. I would not call him if he is not really making the effort. Relationships are about communication, and if he is distancing himself from you instead of building on your relationship, you really shouldn't have to get it out of him. The hardest part is leaving things alone and seeing what he will do, but life still goes on- especially for you. Don't wait indefinitely for him to come through. If it is meant to be, it will be.