What are the limits of interaction for a fiancé with his fiancée, to whom he is bound by a marriage contract, in order to avoid fitna, and is complete avoidance a solution for that?

What is permissible for the husband is permissible for the one who has concluded the marriage contract, because he is legally a husband. The prohibition of consummation before the wedding is a custom to prevent the harm of divorce and its consequences. Therefore, everything that is permissible for a husband from his wife is permissible for the one who has concluded the marriage contract, while observing the custom. Complete avoidance of the wife may lead to alienation and aversion.