There are some common problems or relationship mistakes that women usually make which need to be avoided in order to lead a happier as well as a healthy relationship. If a woman is able to handle these problems before they even start, then the relationship would stay healthier for sure and that too for a very long time.
And the answer is the man himself. The woman would constantly complain regarding his interaction with that other woman and would turn out to believe that her man is probably having something more than a normal conversation with the other woman. This may not be the case most of the times, which is why sometimes it is okay to let your man have a conversation with another woman in peace.
It is not compulsory that when two people of opposite gender talk then there is this one thing between them, which would either be sexual tension or physical attraction.