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If you see green, it will come back. This past winter was hard on plants in many areas so some plants may have died back to the roots. It sounds like this has happened with your passion vine. But it will recover quickly of the roots are still alive.

This article may help: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

It sounds like your soil has too much nitrogen. It makes lots of leaves but little in the way of flowers and fruit. Add some phosphorous, such as in bone meal.

These articles may help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/understanding-nitrogen-requirements-for-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/phosphorus-plant-growth.htm

With the unusual cold that happened in many areas this past winter, it is possible that the plant did not survive the winter. If you do not see it sprouting by the end of this month, it did not survive. This article may be helpful: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

Use fabric ties or pantyhose to tie stems to the structure until the plant naturally does this on its own. Choose a large stem and bring it as close to a post as possible. When your vine begins climbing up on its own, you will need to prune it regularly. For instance, if the vine begins to get too bushy in one area, trim it back. Likewise, if the vine begins heading in a direction where you do not want it to go, trim back the wayward stem.

Here's an article or two that you may find helpful: https://www.gardeningknowhow.com/ornamental/vines/passion-flower/the-passion-flower-a-perfect-tropical-vine-for-growing-indoors.htm
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm