My ex bf

I’ve dated my ex for a year and we broke up recently. We stopped talking bc he said things that hurt my feeling but apologized for it after weeks. And I took some time to think about it and probably a month later I forgave him but I told him I don’t want him in my life bc I know if I start a friendship with him i won’t be happy bc thats not what I want. And recently I started to talk to him slowly but now that I thought of it I’m in love with him still and I don’t know how to tell him bc I don’t think he loves my back they way I love him. So we’re just casually friends and I want to break this friendship off but not tell him why and idk how to do that.