i.e. Maybe a week or so to a month in, where you're not actively in a relationship, but have been out a few times, and you know the person has developed feelings already.
Good thing is your not going to be breaking his heart if only been a few weeks. Unless he’s a nutcase then it’s good to be rid of him. Will just be more a blow to his ego than anything else. I would just say something like: ‘I’m just getting back into the dating scene and I’m not ready to commit myself to one person. I want to see what else is out there ‘ Or you could do what everyone does now and just ghost O_o