Why does my budgie not trust me anymore, or seems scared of me?
You clipped his wings, that is more than enough abuse to make him not trust you. He did not need to scream or struggle, since you are bigger and stronger what else was he suppose to do, other than to let it happen? I never clipped any of the birds I've had over the years, but then I gained their trust and bonded to them, to where handling their wings, feet or trimming nails and beak would not have been a problem. So as far as rebuilding the trust (you never actually had a bond), you start from square one. If you had a bond he'd have been over it by the next day, unless you had hurt him.
I have these problems, she is scared of me I did get her on my hand by putting food she likes on my hand. maybe your bird has gone a bit feral. just do the training again. or do u think he might be getting sexual maturity????maybe get some one else to clip wings.