Teach me how to cope with losses

Well first of all, if losing LP is to hard for you to handle, don't play ranked in the first place, just play norms. If you can't handle losing in norms either, what that tells you is that you don't actually like League, you just like winning. At which point you should limit yourself to bot matches and find different games that you actually like.

i just quit ranked after my second loss in a row

yeah thats normal id suggest playing normals or not playing for a few days