How can I break it off? I just want to be alone.?

So maybe im being a bit drastic but here's the situation. I do love my boyfriend, he's an amazing guy is ok with my kiddos treats me well and all that stuff. Well we have been living together for 3 years now and for the last 3 years we have had virtually no intimacy in our relationship. I have tried everything he has even tried but he's just not into it. So the problem is this we are completely compatible except when it comes to the bedroom, but he also is missing when it comes to other forms of intimacy. We don't cuddle, kiss or have little moments our relationship is almost totally platonic. I know he is not cheating on me we can trust each other 100%. He just isn't interested in the romantic stuff. I had a blow out with him about 3 months ago where I just let it all out again and he tried for about a week or so but this time it was different, I didn't want to try anymore I'm tired of getting my hopes up. The other issue is he feels and believes that everything is ok. He doesn't understand that we are lacking in some very important areas and I'm sure I confuse him even more when I say no. Although when he tries its so subtle I sometimes wonder if he's really into it or just doing it because I asked, again. I've got to the point where I just feel like there is something really wrong with me and decided I just need and really want to be single. Now how to convince him that this isn't working and that his delusions of our perfect relationship just don't exist? I've tried being direct but he thinks I'm "just being silly." Should I give it more time? I just don't know what to do anymore.