Why is my plant becoming like this? I have been watering it and looks like...

Looks like the pot is very small. Invest in a bigger one and repot it, the roots have no room to expand so the leaves are dying

Are you sure you are watering it?

Repot in bigger pot. Root system suffocate and don’t have enough space to spread. Top tip soak root in seaweed water overnight and repot it. 👍