I'm not into my boyfriend touching me anymore.
How so? What made you think of this?
I am not into sex as much as I was with him anymore, he repulses me.
Your feelings are valid if you have no desire for him to touch you. Get some therapy together to see if this can be rectified with proper treatment. You will be unhappy in your relationship and grow apart otherwise if you ignore this situation for too long.
That seems too difficult to me, he should leave me alone and not bother me.
Your partner also deserves to be in a loving relationship and he may really want to still touch you and engage sexually. Its unfair to him to not have a conversation and perhaps get help, because I'm sure you both want to be with someone you'd like to be touched by.