"He was their enemy the whole time, but she made him forget, so he could change." -Cole
Somebody said they think this is about Solas and Lavellan. Thoughts?
Depends on whether or not it shows up outside of a Solavellan playthrough, I suppose.
If it's exclusive, then maybe. It reminds me of his other line,
If you're real, then it means everyone could be real. Which I interpret as... if he sees Lavellan as an individual, loves her for who she is, then he has to see the Dalish, city elves, etc. as individuals, too. He can't just discount them for being ignorant or desperate. He has a responsibility to them, 'cause he put them in this mess trying to get them out of another mess LOL.
The problem with the line you mentioned (besides some people linking it to Revan etc) is that I don't think Solas was ever the enemy. I mean, until we find out what his plans are, and whether he intentionally gave the orb to Corypheus
knowing what he would do with it...
He says he's tired of fighting but I think a certain someone inadvertently convinced him that it was time to assume the title of
God of Rebellion once again.

(And got her heart broke for it. Oops.)