Tulips bloom, their leaves take in sun for a brief period and then turn yellow and die. The bulb lives on if it got enough nutrition and after going through a long dormant period, including time in the cold, it can bloom again.

It is hard to get potted tulips to rebloom, even if you plant them in a garden immediately after they are done blooming. I hate to say but I'd ditch them when they are done blooming.