When someone knows that you can't get over them, do they use that to their advantage?

I am still friends with my ex, but I feel he uses me and hurts my feelings without realizing it or maybe he does and doesn't care.

Like this morning, he said I was going to be flirty with you lol but then proceeds not to say it like in a way knowing this would affect me so and give me hope when there is none.

I know if I'm not over him then I need to let this friendship go but I don't know how. He's all I have and I'm all he has. I was deeply depressed and he helped bring me out of that depression.

I feel like I would go back into it if he is no longer in my life. So what do I do?
When someone knows that you can't get over them, do they use that to their advantage?
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