Accidental SD?

So I’ve been working as a personal trainer and on my first day this guy came to me asking me to train him, and since then I’ve been training him 3/4 times a week. But over the last 2/3 weeks he’s been buying me a lot of expensive gifts, perfume, make up, sending me lunch during work etc

I had been complaining about my phone being stuck all the time. Last week before our session, he drove me to the Apple store and bought me a new phone (iPhone 8) and I’m currently taking driving lessons and last night he offered to buy me a car? He also always pays me a couple of 100s more than he should be paying me.

It’s completely platonic. He’s my client and I don’t really want to pursue anything with him. He’s really really sweet and humble, and takes better care of me than my current SD, how should I approach this?