God says in the tochacha "if you walk keri with Me". So many different translations for this word. The Aryeh Kaplan Chumash has a list. But it means something like badly, casually, familiarly, contrary, selfishly, carelessly, etc. Keri is also not such a nice word in halachic Hebrew for someone who is impure and needs to go to mikvah.
But this word can very easily be changed into something good, because in the parsha there are also 2 instances of the word kariv which means to come close and be connected. Often this is with a korban (more letters added to keri). So adding a Hebrew ב beis fixes the word. And a beis is also comparable to the number 2.
So you see, with 2 you can fix things. A relationship can fix things. And all good relationships where people are respectful and not careless are a blessing. By taking care of both people in a relationship it removes the keri, perhaps meaning selfishness and only thinking of yourself. Because maybe that's what leads to being keri, it's just about you.
One more instance of keri or kariv appears in the parsha, but this time with the letters rearranged. God finally says לא יבקר בין טוב לרע do not yivaker-distinguish between good and bad... Because it will not be holy (Lev27:33). This is like we have read a number of times in Torah, God does not want your offerings. God just wants you to do the mitzvot, the commandments. Do not distinguish only yourself, just do the right thing and think of both us.
Please God this will bring peace, freedom and loving relationships.
