Lately I don't want to go on Twitch anymore because of my ex.
Why wouldn't you want to go on there because of your ex?
I hear all my twitch chat members saying that I was gay for a man
Spreading false rumors about you is one of the worst things your ex could have done, you are free to stop doing things that you don't like anytime in most cases. Let her do what she wants, the truth always come out in the end. You will be too obsessed with this and it will make your mind go crazy otherwise.
I should let it be?
That would be the best thing is to let it be. Like I was saying worrying too much about this is only going to cause you emotional harm.