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Over-watering would cause the wilt you are describing. How often were you watering it? Does the soil feel damp or soggy?

How hot a room is it in? Passion plants prefer a 65 - 80 F range. Is it in direct sunlight? Passion plants prefer bright but indirect sunlight. Low humidity could also cause the plant to wilt - you may want to consider misting or utilizing a humidifier.

No, they will not kill your passion vine - it will recover. Here is an article that will help you identify which caterpillar you have:

http://www.birdsandblooms.com/blog/passionvine-and-its-butterflies/

Lastly, here is an article that will help you on how to get rid of caterpillars (if you find them undesirable):

https://www.gardeningknowhow.com/plant-problems/pests/insects/prevent-caterpillars.htm

Yes, this is normal- it depends on the variety grown. Most varieties have three-lobed leaves, but there are some with single lobed leaves. For more information on passion flower vines, please visit the following link:

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

Happy gardening!

Here is a link with care information.

https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm

Yellowing leaves generally does indicate a watering issue, to much or to little.

Check the soil. If it feels dry you may need to increase watering, especially in temperatures above 85 degrees.
If this is a container plant you may need to water twice a day in warm weather.

https://www.gardeningknowhow.com/ornamental/vines/passion-flower/passion-flower-care.htm

The soil may have more nitrogen than phosphorus, which is responsible for the blooming. Add some phosphorus rich fertilizer or bone meal to the soil to help with flowering.