I am far from convinced that you should split up. At least not yet. Ever heard of the 7 year itch?
Let's run through your list:
- not "in love".
I am neither in the camp that says "being in love always fades with time" nor in the camp that says "you can and should be in love with your DH forever and ever, all the time".
My view is that being "in love" comes and goes. So there are likely to be periods when you don't feel in love with your OH. The real question is, how long has that been, and can you see it coming back?
I think that if you've been together 6 years, and you've only been having wobbles for 6 months, it would be over hasty to split up now. (But obviously, don't get married or have kids). Give it more time. Make more effort... then reconsider in another 6 months. You have plenty of time.
(2) don't miss him when I go away for work.
Hmmm. When I'm away I'm busy and in a different environment and don't miss DH. However when HE goes away, I really miss him. How do you feel when your OH goes away? That's a much better test.
(3) never have sex. think he is good looking but don't think about him sexually.
Again... this can come and go. Give it longer. And do try having sex even if you don't massively feel like it. You may find you enjoy it and it wakes your desire for your OH up again. If, having tried that a few times, you still feel the same... then that's a better signal you shouldn't be with him.
(4) fancy someone else, sexually.
I'd be inclined to say this is "grass is greener" syndrome. Doesn't necessarily mean much your OH isn't right for you long term ... rather, it means there is an issue with your relationship right now which is making you look elsewhere.
(5) prefer to spend time with friends than seeing OH.
This is the one that I think is most serious to be honest. If you genuinely prefer spending time with people other than your OH then he is not the right person. However you also say you enjoy spending time with your OH. Is it that you prefer your friends to your OH? Or is it that you prefer going out to staying in?
Anyway, I guess my overall message is give it more time. 6 months in the context of a 6 year relationship is not that long.
best of luck.