Okay, let's put this in the simplest terms possible.

You have option A.

You have option B.

A will make you really, really happy. You know you'll enjoy it and love your life.

B will also make you really, really happy. You know you'll enjoy it and love your life.

Both are equally great but very different experiences, and both are integral to finding out who you are as a person and getting the most out of life. Remember, you're gonna die some day.

If you choose option A, you can fulfill that opportunity and still go on to do option B. If you choose option B, that's it. You will never, ever get the chance to experience option A.

I want to experience both. If I move back in with my boyfriend, that's it. I will never live alone again. And while I love my boyfriend and enjoy living with him immensely, I want to live alone for a little while longer because I really enjoy that, too, and have had very little opportunity to do so.

So yes, I am getting less out of life if I move in with him right now and never live alone again. Duh. People get less out of life if they don't travel. They get less out of life if they don't learn a new language. Or fly a plane. Or go scuba diving. Or own a pet. Doesn't mean they aren't totally happy with their life, but if you want to do something and have the opportunity to do so, and you know it will make you happy and you will never have the chance to do so again, nor will you want to do it in the future, why wouldn't you do it?