A really nice colleague has asked me out, but it's a 'no' from me, for various reasons.
I don't think I'd be comfortable getting involved with any colleague, as I'm quite private about thing like that and nothing in our place stays private.
I also know that I'm probably not in the right place emotionally. My ex died last year and that has messed with my head a lot. I still can't see past all that.
Obviously, I don't want to hit him with that.
So what's the best way of saying "thanks, but no thanks"?