Let anything happen outside, but do not react.
Observe the truth as it is. But when we don't know the technique of observing ourselves - the technique of self-realisation, the technique of truth realisation - then we can't work out our own salvation.
For example, you may try to divert your attention. You are very miserable and you can't change the other person or the outside situation, so you try to divert your mind. You go to the cinema or a theatre, or worse, to a bar or gambling casino, to divert your attention.
For a while you may feel that your misery is gone. This is an illusion: You have not come out of your misery; it is still there. You have merely diverted your attention, and the misery has gone deep inside. Time and time again it will erupt and overpower you. You have not come out of your misery.
There is another way of diverting your mind, this in the name of religion. You go to a temple, a mosque, a gurudwara, or a pagoda, to chant or pray. Your mind will be diverted, and you may feel quite happy. But again, this is an escape. You are not facing your problem. This was not the dharma of ancient India.