I also think that he forces Saber to stay out of the fights because he can. I'm sure he doesn't want Rin to get hurt(he did take that stake to the hand remember?), but she is a Master in the Holy Grail War, so he can't do much to stop her. On the other hand, Saber is his servant, so he can literally command her to not fight.
And of course, he's in love with her. If that isn't obvious, nothing is.
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