Plant is falling over

This may be due to multiple factors:

1. It can be caused by overwatering, stem rot, nutrient deficiency, or the plant is too heavy to support itself. Be sure to check the stem and soil to see if there are any visible damages or infections.
2. If this is not the case, make sure the plant has adequate light and fertilizer. Some plants do require something to climb on, make sure to add a trellis, moss pole, or something to allow your plant to grow upward.