Badidas- do you know what makes you feel like spending your life with him isn’t a secure and happy feeling anymore? Do you worry he doesn’t want to be with you?
If you still love being with him I would go to couples counselling, as there may be some hope there.
Not sure about the sex thing - I think it does fade over time and is something you have to remember to put the effort into as it really helps maintain that closeness.
Has he changed in how he looks / let himself go a bit that might be affecting the attraction?
I think myself and my husband have personality types that love security and familiarity - so we’ve always wanted to be together forever, but who knows what will happen in the future. I know it’s not like that for other people and I sometimes think we are quite different to others in that way.
I think it’s a wonderful thing to have someone you love being with and that you know will be there forever (obviously no one knows 100%) so if there is anything there you want to keep then it’s worth a try.
No relationship is perfect - we all have days when our partners annoy us, or our lives seem boring, or we don’t fancy our partners. So I would say it’s possible that you might just be worrying you’re not in love because the excitement phase has passed.
Obviously you know best and will know in your gut what’s right for you, but I know I had a similar feeling of am I in love? So I just like to let people know I made it through and realised it’s because we are fed a load of crap basically about how relationships should be.
Just a random question - but would you ever want to get married?