Alright guys I need your help finding a story. I read it a long time ago (I'm pretty sure on this site) and I don't remember much.

It takes place in the past, Kagame and the gang are searching for the shards, somehow Kagome and Sesshoumaru start seeing each other secretly, I'm pretty sure eventually Miroku finds out and becomes Kagome's confidant, Inuyasha finally figures out what's going on, this leads to a Sess/kag break up, but they of course get back together a bit later.

That's all I can remember, I don't know the rating or if it was finished. Hopefully this rings some bells!

Do you have anything more specific? Thats a really common plot actually.

Not really, its been so long since I read it. I know at one point, when Kagome is still keeping the relationship a secret, she has a mental break down. Miroku comes and comforts her, they have a real sweet relationship.

Is it Wandering Ways by Marina Lenore on FFN?(M there, MA here)
At the final battle with Naraku two unexpected things happen - the first being Naraku shattering the Shikon just before his death, and the second being a forging of a connection that nobody could possibly have predicted. Well, nobody except Miroku, that is. Complete.
www.fanfiction.net/s/11676784/1/Wandering-Ways