How to never fall in love?

No expectations.

It's not hard to do. But you need to be committed to that, you need to be committed to yourself and your life.

If you are just dealing with a lot, it will be harder to fall in love.
Don't go on any dates or to places you can meet people. I'd say enjoy your life and have fun, minimize the exposure to, well, I am about to reiterate here lol...

Learn to embrace solitude and a more solitary existence,
and just hang with your friends and family.

Still no guarantee though, is it.

I think you can choose not to? Not sure.

Avoid people. It works for me.

Avoid getting too close. It happens by intent when we are intentionally spending a lot of time together chatting, sharing, etc..

Just bar anyone you feel you have a connection with from your life.

I don't think it's a choice.

Never cuddle, don't kiss, don't talk everyday, etc.