Don't want to break his heart💗

I've never dumped anyone before but have decided that my current two year relationship isn't working for me anymore. It's so sad because I do still love him so much, but I just know that we aren't 'the one' for eachother. Thing is, I'm so scared of hurting him. I know that he will be absolutely devastated and so heart broken and I don't want to do that to him. Is there any way of doing this nicely? I don't know how to say that I want to spread my wings without him feeling like he isn't good enough for me anymore. I will miss him terribly but I think we both need to find ourselves.