"guess"的後面...

Your concept is right and it is reasonable for you to think so.
It is an informal style of writing or speaking,especially in American English. A future tense is used after "I guess" to suppose that something is true or likely.
e.g. I guess that you will be looking for a new job now.
My guess is that there won't be many people there today.
I guess this feeling will never end.
Present tense is seldom used after I guess (X--> I guess this feeling never ends)
The omission of "will" is understandable in speaking but not yet established in formal writing.

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The subject of the sentence is " I " , so it should be end not ends, which is used for singular pronoun.

''i GUESS THIS FEELING NEVER ENDS''

YOU 2 ARE ALREADY WRONG..~