I am learning Japanese and I'm always mixing these two. Can someone explain
what's the difference between them and how are they used?

My only understanding is the first is `verb+tte+ita` which is kinda like "it
was like that" but the other one I have no idea and it's used in all the same
cases.
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2015-05-01T09:13:43.350
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past
atteita vs atteimashita
atteita(あっていた) and atteimashita(あっていました) both mean the same, and they mean "it
was right". The difference between them are politeness. atteita is a casual
expression and atteimashita is a formal one. So if you talk to your friends
you can say atteita, and if you want to talk to your teacher or your boss, you
can say atteimashita.
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2015-05-01T10:38:13.220
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answer