i need help with a cat i have aquired,he came to me at 15weeks old,he is now 20weeks.he was let to run wild in his last home,we have kept him in,so he didn't wonder off,he his now microchipped and is going to be neutered,when he is the right age,but he is ,so desperate to go out,he crys at the door,i just don't know what to do,am i being cruel not letting him out,he his a loverly cat,loves to play,and climb,he has spotted the trees in the garden,so help what do i do with him