Lately I've had the strongest feelings for my ex gf. Now, this isn't just any ex gf. Me and her dated for two years+ before things ended poorly. This time of year always reminds me of her. Always. I can't stop thinking about her. Most of my friends say "well just think of why you broke up and you'll be ok." And really, that's not the case. I'm sorry for the way things ended, but I don't think I could ever talk to her, so this nullifys any suggestions of "go talk to her."

Other than that, there's other things making me feel like a batshit insane man, but this is the primary idea that keeps me feeling this way.
Halp.

Go talk to her.

If what you had was powerful, and you weren't a complete dick (eg raped her sister), then I don't see why you can't talk to her, see where things might go from there.

Trust me, I've been in similar situations. Which isn't to say the relationship worked out, but we've gotten back together for a while, which was nice.

Or you could just accept that it's done and get on with your life.

I've been in situations where I couldn't stop thinking about an ex and I had friends who would tell me stuff like "Think about why you broke up and you'll be okay" "Everything happens for a reason"...Doesn't work.

Then I have a brother who says "Oh get the fuck over it...She was a cunt anyway and you're better off without her bruv!...Fuckin' forget her and get the fuck on with it and stop being such a pussy! Go out and get a bird, fuck the arse off it and tell me you don't feel better...I dare ya!"

The latter helped...And whenever I thought about her after that I'd remember those words and remember that even thought my brother is a big, smelly, hairy tosspot with no heart but a pump moving his blood around his body, he's right.

So shut the fuck up, keep your chin up, go the fuck out and get your cock wet you baby! :D