Pending heartbreak

So this is a messy one but please bare with me.

I've fallen in love with a man I can't be with and I know I need to cut my ties with him..

In a nutshell... we became friends while we were both in relationships. I ended up single. He ended up engaged. And our friendship grew. For a long time he would vent about his relationship troubles to me which led to a really strong connect between us. We both developed feeling for each other and because he wasn't available I put some serious distance between us.

He knows I'm in love with him and had said he loves me as well. He has said repeatedly he doesn't see the marriage lasting and that he isn't happy but that he feels obligated to go through with it because it's to late to call off. He has had the cheek to actually say he thinks eventually we will end up together. He says he is torn between what we could be, and the stability of what he has.

Anyway.. I feel like I'm being strung along. Like he wants to have both. Like I'm being used in a way.. almost like an outlet..

That being said I've decided that if he goes through with this, and Marrys her, I need to cut all ties. Block him. Maybe even move..

I'm right aren't I? If he had any respect for me (let alone love) he wouldnt go through with the wedding?

I feel so ridiculous. We haven't even kissed but I really do feel like my heart is about to be broken. I feel so stupid.