You are so very lucky OP. because if i had said that to my DP, he would have said "don't let the door hit your arse on the way out"
You DH clearly loves you so very much, and after you have told him that (can you just imagine how much that must have hurt) he tried for find ways to make you happy? Breakfast in bed every day? Cooks dinner every night? After 18years? I truly envy you. I'd give anything if my DP loved me half that much.
I do understand you feel you are missing out but i can tell you from bitter experience of a long line of one night stands, it eats away at your self esteem. A series of men who are quite happy to poke their cock in you, but don't actually want to take you out, spend time with you? In fact, i had one guy who wouldn't even let me stay until morning
Oh yeah, it was brilliant, i felt like a indepedent, dont give a fuck woman, who just was so sooo sexy
. Really, its not all its cracked up to be, it certainly wont be like a scene from 50 shades!!! It will most likely be crap sex too!
Have another talk wiht your husband and talk about things you can do TOGETHER to start making life more exciting again. Maybe even spice up the bedroom a bit? And i don't mean burn joss sticks either ;-)
I dont think you are selfish, i just think you are being a bit niave!