If he's mounting, getting very aggressive towards you or your mare, separate them. A real gelded horse usually doesn't act studdy unless 1) he was bred before he was cut, 2) he's crypt. Did you witness him being gelded? Its hard to say whether he'll act this way even after she's pregnant, but I would separate them for safty of everyone. As for heat cycles, it varies with each mare. They have their real time to be bred out of the whole breeding season its just finding it. It can go two days clear out till nearly two weeks in which I've had that done.
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