Now that I discovered that I can be happy without you
You've realized that missing me isn't going to serve you
Or: You've realized that missing me won't do you any good
I leave you alone
Or: I'll leave you alone
I have a long way to go
Or: I've got a long way to go
And whatever
'Ni modo' is an expression which is similar to 'whatever' or 'oh well'
When you see me again, it's going to cost you
Or: When you see me again, it's going to be hard for you
And I already understood it, I am not for you
Or: And I get it, I'm not for you
Don't worry either I won't suffer more
Or: Don't worry anymore I'm not going to suffer