Thanks everyone.

The first week I had him, all I could think of was him being crazy. He would constantly jump on the table and table surf, and just not really interact with me at all. Now, he will look at me to see if everything is alright, and he will grab his tug toy so I can play with him. He still trys to table surf, but he is SOO much better now. I can't believe 2 months ago I really wanted him to get adopted, and now I sorta want him to stay!
(I really have trouble teaching leave it…. He really loves food, but I still blame myself for not doing a good job.)