I've cheated on my partner a few times before in the past, but now I want to stop because she says she will leave me if I don't. I don't want to do it again, but I know my weaknesses, so I'm not sure if I can really stop. How can I stop cheating on her?

Wish common sense is also common. :) You yourself already know what to do. Don't play dumb or something. Cheating is a choice. If you're not happy, leave. Mas maiintindihan pa siguro ng partner mo pag nakipaghiwalay ka ng maayos kesa mag c-cheat ka pa. And kung gusto mo matigil pag c-cheat mo, nasa saiyo na yun. Malaki ka na alam mo ang tama at mali.