Yes, he is at that age where they are looking for love, and the females are very active too so it could be that. And if that is the case (most likely) they will go months without food.
What are the temps, out of curiosity?
I would cut back on the feeding, one mouse a week is plenty. Here is a link to the
Munson Plan, it will give you a good feeding schedule (although a bit aggressive for little guys) so he doesn't get over/underweight and is healthy.