Oh OP.

We’re not going to “come for you” over the title. Say no. When your answer to “should we get married” is anything less than “hell yes”, say no.

He will be sad. Let me tell you something that’s going to be incredibly important to you: Let him be sad. Don’t fix it. Tell his friends he’s sad and they should check on him, and then immediately block all of them.

He is making you unhappy, he keeps hurting you, and you are feeling guilty in advance for leaving because he has made you believe you are to blame for his feelings. You are not. You won’t be.

Sometimes relationships end. It’s not the end of the world. He will manage.

Let go of the idea that his feelings are yours to make better.