Relationships

Situationship with my Best Friend?

I have known this guy and been Best Friends with him for 25 years.
I have seen him get Married and have his first child. I have also seen him get divorced to said Wife. (Divorced now, 7 years ago.)
About 12 months ago, we somehow managed to get ourselves into a Situationship.
I recently told him that I don't think that it's a good idea that we continue as it is causing too much heartache for the both of us and it is ruining our friendship. (He on occasions kept calling me his Ex Wife's name and told me that I remind him of her and some of the things she did. He did also admit to me that he still loves her.)
I told him that I am happy to remain friends with him and he said he is okay with that, despite having feelings for me. I started to then back away from the situation.
He of late keeps randomly texting me and telling me that he doesn't want to lose me, and I established that it's because he's worried that I will find someone else.
This morning, he sent me a message telling me that he loves me and that he wants to be with me and that not being with me, stresses him out.
I then asked him if it only stresses him not being with me because he's worried that I will find someone else and he replied back with, "Nope. I love you."
Please forgive my naivety, but I'm really unsure what to think about all of this? Anyone have any advice?
Situationship with my Best Friend?
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