I leave him alone. Males are smelly and aggressive. The less you have the better. Don't feel bad for the little guy. He has to stay by himself for a little while and then he gets to hang out with two females for a few weeks without having to fight with other males for their attention. If you still think he will be lonely get him a wheel or something. I don't give mine one because they just stink that all up too but, your mice, your call.
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