Do you think he's fasting?

[CosmicOwl]

It's been two weeks since my grey rat snake last ate, which is unusual for him. When he didn't eat last week, I assumed he must be getting ready to shed, because that is essentially the only time he will turn down food. After another week though, he hasn't gone into shed and he's been very active. Every night he has been out patrolling his enclosure as if he was hunting.

I've offered him mice, rats and a chick, but he hasn't attempted to eat any of them. He smells them and even follows them a bit, but won't commit to biting. It's almost like he changes his mind at the last. Otherwise, he seems healthy. He's active, alert and has plenty of energy. So, my next thought is that he might be fasting for breeding season. However, it seems a bit early and I haven't done anything to simulation a changing of the seasons

He's 17 months old, about 4.5 feet long and 436 grams, which seems a bit on the young/small side. He's kept at the same temps, in the same room with two other snakes that still eating. What do you guys think? Is he fasting or maybe just taking a break for some other unexplainable snake reason?