Why am i suddenly uninterested in my boyfriend?

So here’s a bit of a brief. I’ve (F26) been dating my boyfriend (M30) officially for 6 months now, known him for 7. I’m his first girlfriend, he’s my third. We met on Tinder and I thought he was the nicest guy (albeit not really my type physically), started dating and got on like a house on fire and the rest is pretty much history, or so I thought.

To clarify my boyfriend hasn’t done anything wrong, in fact he’s done everything right. He treats me well, focuses on the small things, makes me a priority, includes me in his plans for the future and wants to do life with me. He basically ticks all the boxes in what someone would want in a partner.

As time goes on I’m starting to lose interest in him, which is annoying to me because why would I not want someone as kind and caring as him? I started feeling this way about a month ago, at first I thought I was just overwhelmed because he’s quite clingy, but I just don’t want to be intimate with him and don’t want to stay around at his house, and little things are starting to annoy me. It’s hard to explain but it’s like I’m turned off completely, and he hasn’t done anything wrong to cause this.

I just really want to know if anyone else ever had/has this issue, because I’m starting to feel like I’m a bad person.

TL;DR I’ve suddenly lost interest in my boyfriend of 6 months even though he’s such a lovely guy.