Ahahah, I just gave you a manga scan that proved that Obito did not start this war because of Rin, and you still call me a fanboy. Do you even know what a fanboy is? Get your shit together.
And that was the reason to not return to Konoha.
Read what Obito says ''Any feelings of guilt or selfcondemnation you've felt... are absurd. If you really think the impetus for this war was you and Rin... Well... you just need to stop flattering yourselves''.
Can you not do something called reading in-between the lines? You're clearly deluded about how to interpret a character and his/her motives.
Do you think Obito wants Kakashi to think he understands him for everything he's done? Obviously Obito isn't going to say "Yeah, you're right! Spot on Kakashi, you really do understand me!" He doesn't want to come across like that, that's the only reason why he said that.
Please you really need to use your brain a little, look at everything that's happened up until now. He's been thinking of Rin throughout the entire battle and it's just plain obvious.
Just stop babbling about your beloved character and think for a moment.
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Manga >>> your bullshit
facts >>> opinion
Kishi >>> you