Someone please explain

You'll stay in your comfornt zone, and you'll keep wanting MORE reassurance and each time you get it you feel like it's not enough so you CONSTANTLY NEED it and it doesn't help you beat the problem you'll just be simering in it for longer.

It will never be enough. Its bad for ocd because it can be ocd. It's a common compulsion to seek reassurance. It reinforces the walls to your comfort zone but ironically cages you within it. Your comfort zone is like a place of rest at the end of the day. Life gets uncomfortable when you leave it sometimes. Doesn't mean you should avoid going through discomfort especially when it benefits you in the end. Reassurance counteracts all that and provides shelter when you're supposed to be vulnerable. That's when you grow

Here’s an article about seeking reassurance and why it’s bad for those with OCD. The Psychology of Seeking Reassurance: https://www.treatmyocd.com/blog/reassurance-seeking-ocd-anxiety-how-to-stop-cycle

Seeking reassurance tells your brain that your intrusions are important. And when something is important our brain tends to focus on it more, causing the frequency of the intrusions popping up in your head to go up. The more the intrusions pop up, the more anxiety we feel, the more compulsions we do and the more reassurance we seek. By doing that, we give attention to the intrusions and signal our brain again that they are very important, which leads to our brain focusing on them even more and increasing the frequency of them popping up in our head again goes up. This goes on and on and at some point it turns in to a vicious cycle.