Answer: The cold weather has taken a toll on many, many plants in your gardening region this winter. Pink bower vines are hardy only to about 30F so it's likely the vines have been killed back to the ground. I'd prune them back in anticipation of new growth this spring. As long as the roots survived the cold spell, they will develop healthy new stems when the weather warms. Pink bower vines are routinely cut down to ground level every 3-4 years to help control their size so cutting yours back won't hurt it a bit.
Best wishes with your landscape!
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