I think I want to break up, but I’m not sure

I (22f) am considering ending things with my bf (26m). I just can’t make the decision.

We met in my first ever uni class. We’ve been through a lot. We comforted each other when our dogs died. He graduated early because he’s so damn smart that he was able to take extra classes.

We spent a lot of time together and talked a lot. He’s a genuinely good person.

But now things are different. It’s so rare that we get to spend any time together. Our conversations have devolved so much, he usually only gives one word answers.

I don’t feel attracted to him. I don’t feel super happy when he finally responds to my texts (because it’s usually one word answers!). I just get a “meh” feeling when I think about him.

(And please don’t think that I’m spamming him. It usually takes days to get any kind of response.)

And lately, he’s been pretty disrespectful. I invited him to see a movie with me, and flat out refused because he read one bad review of it. He then insulted my knowledge of movies.

Look, he’s a good dude. He’s helped me through a lot. But I just don’t feel it anymore. Being in this relationship feels like being tethered to a corpse. But if I end it, it will completely break his heart.

I’m not sure what to do.