<human>: Throwaway because my boyfriend reddits.

My boyfriend and I have been dating for about six months, and I've known for a while that he feels more strongly about me than I do about him. He texted me "I love you" pretty early on, and about a month ago he said it to my face. I told him that I didn't feel that strongly about him yet, but I liked him a lot and I wanted to keep going and see where my feelings developed.

It's about a month later now, and not only have my feelings toward him not changed (I like him, I like spending time with him, but I don't love him), I am becoming more and more sure that they're not going to change in the future. What's more, in the past I could overlook any doubts I had about the depth of my feelings (or lack thereof) because when I was with him, we had an amazing time, and I enjoyed every minute of it. However, I've noticed recently that I'm often getting bored or not paying attention when he's talking, and it's just not the same quality of time that it used to be. So I've come to the conclusion that it's time to break up. 

The problem is, this is my first "real" relationship (and from what he's told me, his first too - we were both virgins when we met), so I really don't know how to break up with someone! What's worse is that I can tell my boyfriend has no idea anything is wrong - he keeps talking about me meeting his parents next month when they're in town (he already met mine), or going on double dates with his friends. I've been feeling things cooling off, but he hasn't been, and this is going to totally blindside him.  

I've already chickened out of doing it once, but we're meeting for lunch tomorrow and I have to do it this time. How do I break up with him as gently as possible? How do I even bring it up in conversation and avoid chickening out again? Please give me your advice!

Could you distill the essence of the text into 1-3 sentences?
<bot>: He's my first boyfriend ever and he says he loves me, but I feel things cooling off. How do I break up without totally crushing him? I've never had to do this before.