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One of the biggest concerns I had about ending the relationship, and what most guys have in this position is that they are more afraid of the UNKNOWN, than the bullshit unhappy life they have now.
But let me tell you, shit is SO MUCH BETTER on the other side if you are unhappy.
I guess I'm biased since I teach guys how to meet girls for a living, but if your fears are related to finding another girl...
There are so many girls out there, just waiting for you!
Good luck!
It depends on who you are. I split up with a long term girlfriend in my 20s, did some reading up on the whole "meeting and bedding women" thing and spent my time screwing around. It was fun for a short while, but it got old quickly.
What I realised is this: I'm a misanthrope. Most people I meet annoy this shit out of me. I'm sure they were lovely and all, but once biological urges were dealt with, I didn't really want to spend any time with the girls I met, and the idea of going out to find more depressed me.
I finally met (and married) a woman who's even more misanthropic than I am, who understands my need to be left the fuck alone. Sometimes I idly think "wouldn't it be nice to be single and free of responsibility again", but then I go and talk to some random person and remember why it wouldn't.
Also, I have a kid, and that's awesome. Toddlers are far better company than most adults imo.
Having said that... even though that lifestyle wasn't for me, I'm glad I found out first hand, because otherwise I'd be wondering.