Trial separations could help or hurt your marriage in the long run. If you give the WS too much slack in the leash, they might learn that they really would rather be with someone else. If you split temporarily, and they realize that you are the one for them, they will attempt at R. Either way, you will know the truth.
Yes, as has been noted, it might help you find a sense of self and some people have told me that their separation helped them take their power back.
They also realized that they could live very well and happily on their own.
Some people I know who separated did get back together and they claim the separation helped.
There are also people who have divorced and then began dating each other again, and then remarried.
If it's what you feel you need to do, why not?
Have you read up on the 180? It could accomplish the same thing. Detachment and time to reflect. You are trying to decide R or D. In short, are you better off with him or without him. You want to be without him to see that side of the coin. You may be better off forgetting about that other home too far away and see what's available on 6 moth lease closer to you. Maybe one of those business stay locations which are furnished.
"You can't fix a broken man, but he can break you"
You mentioned that your 44 years old husband had sex 3-6 times with a 54 year old woman every time they met?
Firstly let me just clear something up! Just because you are 54 doesn't mean that you are not capable of having sex or enjoying it. I myself am 58 and enjoy it tremendously. In regards to the trial separation have you discussed it with your H and what are his thoughts?