There's no way you can let it go. Confront him...but don't say it's disgusting. If you are lucky, he may tell you details and when/why he started. And then go see a doctor who may be able to help him stop it and come back to whoever he used to be. But if you think this is so disgusting that you don't love him anymore, leave.

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"All we have is this moment, right here, right now. The future is just a ****ing concept that we use to avoid being alive today. So, be here now."