I need space.

My boyfriend and I have been dating for over a year now. He plans to propose to me this year! I want this. But lately I’ve been feeling so overwhelmed. I need space! Just like every person does. I’m getting easily angry at him and I get annoyed in his presence. Because for the last year, every single day, except on special circumstances, we’ve seen each other for most of the day. I used to enjoy this but lately I feel like running away. I’ve asked for space but something always comes up which ends in us seeing each other. He’s not a space type person. He wants to always be with me. He thinks that because I ask him for alone time I’m rejecting him or don’t want to be with him. But we’ve been arguing for a week and I just want it to end! It’s always about small things. (Like when you live with your family and get tired of it so you argue constantly.) If this keeps happening, this relationship is going to end. And he really is the love of my life. This is a completely loving and healthy relationship. We’ve just never been presented this issue. How do I get him to leave me alone for awhile 😭😭?

update: thank you so much for the advice. i got in my head about it. as soon as i explained more he said okay how about we don’t see each other today and tomorrow and then see how it goes from there 🥺❤️❤️