Difference in adding a も


I always thought that the word ても means 'even if'. For example, 一緒に行かなくて **も**
いい would mean ' **Even if** you don't go with me, it is ok'(speaker really
wants to go together but is ok even if they dont go together) . I heard that
removing the も gives the same meaning, but if I look at it logically, wouldn't
"一緒に行かなくていい" mean "Don't come with me" (speaker does not want to go together).
So is there a difference between using も and not using it in the sentence
above?




Maybe this type of も is close to "also" rather than "even". For the (subtle)
difference in meaning, please see: [Difference between てもいい and
ていい?](https://japanese.stackexchange.com/q/53288/5010) For example:

>   * 死んでもいい  
>  I can die (for it, although I don't want to).
>   * 死んでいい  
>  I am allowed to die (because I want to die).
>

行かなくて is just a te-form of 行かない ("not to go"), and it does not have an
imperative meaning by itself. A word-by-word translation of "行かなくていい?" is
something like "Not going, then, fine?". Although 行かないで works as a request
"(Please) don't go", 行かなくて does not have this meaning.

