How do I convince my boyfriend to go vegetarian?

It's for his own good. I've talked to him about the benefits of plant based diet. I told him how meat industry harms the environment and we've discussed ethical issues surrounding but nothing seems to change his mind. He said he can't give up meat.

How do I convince my boyfriend to go vegetarian?
How do I convince my boyfriend to go vegetarian?
How do I convince my boyfriend to go vegetarian?
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