Do you think when a couple separates both are responsible or just one of them?

Whether the separation was for cheating, financial issues, family issues, children issues.

Most of the opinions would normally say both are responsible in one part or the whole part, but then I wonder are both really responsible even if it takes 2 to tango? What if because of the actions of one of the partners is the reason for the other to separate and the other partner instead of trying to resolve things or fix things as adults between them, simply the partner simply do not want a solution. So are both responsible or just the one who simply dont want any solution for their separation, he/she just get distant without any fight to save the marriage.

Like I said it could be cheating, family issues, even financial issues are cause of separation.
Do you think when a couple separates both are responsible or just one of them?
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