Importantly, HOW do I tell him that it's over? I don't know what to say to him or when.

It has to be after the 25th of this month, a week from Sunday.

I feel like saying that my heart is no longer invested in this relationship, that it's not working out, I am not happy, and that I no longer love him. That's what I want to say, which is all 100% true.

I am pretty certain any love left for him is gone now - or at least, I do not feel it and my heart is definitely not invested anymore. The last fight we had did me in and was really the final straw for me.