Are they always housed together? Or just housed together currently for breeding purposes? What sized rats are you feeding?
Try to monitor him-- it may be too much and end in regurgitation, it may not. Either way I would skip his next feeding. You want to give his body some time to rest after such a large meal, and if he regurgitates his organs will need the time to heal. Plus you don't want to encourage him to go on any more fasts, since you mentioned he tends to do that on occasion. It may also be a good idea to remove him from the female, he will reek of rats and will most likely be too sluggish to breed for a couple days anyways. The stress and excitement of being enclosed with a female he is trying to breed may increase your chances of a regurge.
One extra large meal once in a blue moon won't hurt him, except for the possibility for a vomiting episode. That being said, regular overfeeding has been shown to cause fasting, liver disease, organ damage, and early death in many reptiles. Try to avoid that with appropriately sized meals and a properly spaced feeding schedule. Often what these guys get in captivity, even when only being fed once a week or so, is much more than what their bodies were designed and adapted to getting in the wild. Less can be more
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