There are usually three reasons why one partner asks for a “break”.Please keep in mind that "trial separation" is just another codeword for displacing and dispatching the betrayed spouse so that the unfaithful spouse can play around unabated without you being an eyewitness to any of their sordid activities!
1. They want to break up permanently but feel this way is less of a shock.
2. There is another person on the scene who they want to be free to see without being encumbered with a partner/spouse.
3. It’s a **** test and they want the other partner to beg them to come back.
None of these scenarios give any comfort to the partner left behind and in most of the cases I’ve seen option one is the result.