Iīm confused and in need of suggestion.

My indian male finally accepted the female I bought him after his ex-wife was killed by a dog. Now itīs love in the air, theyīre kissing all the time, feeding each other and visiting the nest several times a day. (havenīt seen them mating though)
My question is this: should I let them breed if they decide to do so? The temperature during the
winter gets as low as -5 degree C here. I keep them in the garden, they have an "indoor" area so they can get away from the wind and rain but itīs not isolated. Will the babies make it if the (future) eggs get hached? And no, I wonīt separate them....