<human>: In my first real relationship, his too. We're both 23. It's been almost 6 months. It's pretty clear to me that I'm not falling in love with him, but I'm not sure if that's reason enough to end it. I don't like him any less or anything, it's just not love for me. I don't know whether it is for him, we haven't discussed it. Our 6 month anniversary and his birthday are next week so it's pretty bad timing. Breaking up with him before that would be shitty but I don't really want to do any grand romantic gesture for him. 
I'm just feeling like I'm not going up the hill of love, but I'm not falling over the cliff of breaking up. I'm just sort of teetering on "well it's not great, but it's not bad either, he's a nice guy." How do I know if I should just jump off and break up with him?

Summarize the given text in a few sentences.
<bot>: I've heard people say as soon as you know its time, you should break up. But how do you know? And how do you KNOW you know you know?