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What damage is being done to your passion flower? Have you noticed any insects or insect eggs on your flower? I do know that slugs and snails can be a serious problem for the plant and these articles will give you ideas for getting rid of them:

https://www.gardeningknowhow.com/plant-problems/pests/insects/kill-garden-slugs.htm
https://www.gardeningknowhow.com/plant-problems/pests/organic-snail-control-how-to-control-garden-snails.htm

Caterpillars, beetles and other foliage-chewing insects can also be suspect. Sap-sucking insects, such as spider mites and scale, like to occupy the stems. Remove caterpillars and beetles off by hand and spray smaller insects with insecticidal soap.

I really wanted to suggest it was the passion flower caterpillar (Gulf fritillary) but they usually make an appearance in the fall.

For more information on the care of passion flowers, please visit the following link:
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm

Given that the Passion flower blooms in early summer (mid-June/July) I would not anticipate bud formation until late spring.

For more information on passion flowers, please visit the following link:
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-not-blooming.htm
https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm

Make sure your getting your passion flower plenty of water, sunlight and fertilizer.
A passion flowers will wilt when they are getting ready to fruit. This is usually in spring or early summer.
Here is a couple of good links for you.

https://www.gardeningknowhow.com/ornamental/vines/passion-flower/the-passion-flower-a-perfect-tropical-vine-for-growing-indoors.htm

http://bygl.osu.edu/node/542

I would say your purple passion flower is experiencing what is known as 'bud blast'. It basically means there is an issue in the environment that needs correcting such as water, lighting, humidity, etc. For more information on bud blast, please visit the following article:

https://www.gardeningknowhow.com/plant-problems/environmental/bud-blast-in-flowers.htm

For more information on the care of purple passion flowers, please visit the following link:
https://www.gardeningknowhow.com/houseplants/purple-passion-plant/purple-passion-houseplants.htm

There are a number of reasons why your passion flower leaves are turning yellow such as over/under-watering, insect pests, chlorosis, root issues or nutrient deficiencies, and lack of sunlight. Each of these issues are discussed in turn in the article below. Cutting your passion flower back will not resolve the underlying issue. My recommendation is to review the article below and see if anything resonates with your situation and take measures to correct it.

https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm

The plant is suffering from transplant shock. Generally, it is better to slowly introduce newly potted plants to sunlight rather than putting them right smack into it. They need time to acclimate to their new environment. I would make sure it has plenty of water and move it to a less sunny location for about a week or so and then slowly introduce it to more sunlight as it strengthens. More often than not, plants will recover on their own.