My cat was very much like this too and now she is the friendliest cat around! What I did was kept her in one room (the first place she goes to is where she is most likely to feel safe) put the food in that room. For my cat at first she was under a bed. Just give him a couple weeks or moreand make him feel like he can trust you. Waht I did was I rolled a little ball over to her and it ended up we were playing a game of catch (but rolling the ball back and forth). My cat came from a dump where someone had dropped her and her brothers and sisters off in a paper box and she was most likely abused. Its also to good to give it treats and cat nip (to hyper it up he it will be playful LoL) But anyways, I dont know if this will work for ur cat but it worked 4 mine!