Need serious (love) advice..

I've been with my boyfriend for almost four years and the past year for me the spark has been gone and I've been trying and waiting to see if it'll fully come back (if that makes any sense..) I love him so much but I think the love has changed to a different kind of love, like, friend love. It's just not the same anymore and I really don't want to hurt him because I know it'll break him but I also don't want to start stringing him along. I'm pretty sure he has no idea how I'm feeling or has the slightest idea that I'm unhappy. I'll never be able to speak ill of him because he's such an amazing guy. I don't know what's wrong with me but I'm just not in love with him anymore. I've been beating myself up because I just don't know what to do. We also live together...

So I guess the real question is how do you break up with someone without breaking their heart? Is it even possible?

Please help. 😞