I'm sure he's just fine Mina. A male eating a small rat every week cannot be said to be underfed. That fact that he's out cruising and hunting is a good thing in my mind....means he's alert, active and looking for dinner. Way better than a sluggish, overfed, unhealthy snake that just sort of slurps down food because it's there. All of ours lurk, hunt and so forth for a day or two before feeding day and when they see dinner...they hit like freight trains. For me that's not an indication of a "starving" snake, that's an indication of a supremely healthy snake eating as it's meant to, with deadly accuracy and the power to take down it's prey quickly and efficiently as it should.