<human>: Could you distill the essence of the text into 1-3 sentences?

Hey reddit! Probably a stupid question. I'm a 20 year old female. Started dating again after 7 months now of being single and out of a 9 month relationship. 

Just moved to a new place, don't want to be labelled any harsh names or hurt anyone. Met two guys on tinder. They are fully aware I'm going on dates with other people (as they are). 

Went on three dates with one. He asked me to hang out twice in a row, I took a pass. He then declared that we probably weren't going to work. No real harsh feelings, no fights, I just agreed and accepted it. 

I'm also going on a few dates with another guy John, who I found out has feelings for me through a friend. It will be around our third date now, I'm not sure how I feel but I'm going to make sure I figure it out tonight. One of my guy friends pointed out a) Treat people how you want to be treated b) Don't waste others time. 

My question is by what date should you start discussing if you want something further? I am ready for a relationship if I find the right guy and he might be it but I want to hurt as less people as possible.
<bot>: By what date/ length of time should you know or clarify with your partner, that you want something more? How do I avoid "leading them on"?