What’s the best and easiest way to stop trying to people please?

Like I’ve been people pleasing ever since like elementary school. And even more after I got a job. Recently I’ve been saying no to a lot of people that try to use and take advantage of me being nice. But for those that have stopped people pleasing, what’d you do? Like one guy I thought was my good friend like he always played video games with me, gave me advice and all. But constantly asked for money like I thought oh it’s nothing at first then it’s $5 $5 $10 $15 when it hit 15 I’m done like I’m not working to fund whatever he’s doing I’m working for myself. Now literally he never texts me and only texts when he’s asking for money but im just going to leave that and go my own way
What’s the best and easiest way to stop trying to people please?
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