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It sounds like that it is lacking nutrients. I would recommend giving it some balanced fertilizer. I would also check that it is still getting enough sunlight. Sometimes, over time, surrounding plants and building can block sunlight from a plant and cause it to lose vitality. This article may also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

Your Wisteria vine may need phosphorous.
Here is a link that will help you.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

The vines if cut from plant are no longer alive. They in fact though may be very attached to your home, it's siding and have invaded under the siding. Wisteria is extremely invasive and if attached to a home can do great damage.
I would recommend you have a professional inspect your home and have the vines removed.
Best of luck.
Here is a link that discusses removal of Wisteria Vine.

https://www.gardeningknowhow.com/ornamental/vines/wisteria/controlling-or-getting-rid-of-wisteria.htm

Yes, you may cut them off. It will not hurt the vine to do so.

These plants really resent being moved, so I'm fairly certain that it's simply suffering from transplant shock at this time. As long as the stems are still alive, it should recover and eventually regrow. These articles should help: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm
https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus. This article will also help:
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm