I was with the same person from 18 to 30, and we lived together the whole time and it was really quite a codependent relationship. I definitely felt like I hadn't developed fully as a singular person. What I did was get involved in things I had always wanted to do but couldn't or didn't, either because of the relationship or just in general. I spent a lot of time with friends, made some new friends too, but mostly got a lot more connected with my good friends I already had. Over time I started to feel happy and confident, and I started playing music again which is has been one of the great joys of my life. You're a free agent, which is exciting, because you can do anything you want to now.

Of course you'll be sad too, but it's part of the process. And when you are ready to get back into looking for relationships, you'll have the advantage of having learned from this one, things you want, things you don't... things about your personality that you need to know.
It feels like you won't be able to feel differently, but trust me, you will, given time. The more you work at focusing on your own life and doing things that fulfill you, the faster that time will be. All things always change, the only constant is change. Sometimes people change together and sometimes they don't, but you absolutely will move on. Breakups are tough, no doubt about it, but try to keep your eye on the prize. And the prize is yourself, being who you want to be.
