Falling out of love

I’ve been seeing my bf for the past yr. things were great in the beginning. But then we started having problems. He tells me he loves me all the time, during sex, over and over and I just don’t feel this word has value any more although i know he means it. Also, he doesn’t understand that i need my space and wants to talk to me on the phone all the time even if there is nothing to say which only makes me feel awkward. Like, we are just on the phone hearing each other breath. I tried telling him i want a break, and honestly i dont want to break up with him, i just want some time for myself and his reply is how are you going to manage when we get married? What are you going to do when you need your space then? Also if the roles were revered and I asked you for a break, how would you feel? I would be devastated but i cannot continue this way. I am suffocating. I don’t want to loose him but I don’t know how to tell him its too much. Im an introvert. He was very understanding in the beginning to that fact, but now he just gets offended which pushes me further away!