Is 'nice' enough?

[JK111]

Ive been with my partner 2 years - hes lovely, looks after me and feels like "home". Really loves me.
We split up briefly (my doing) a few months ago but stayed in touch and are now back on.
Since then I feel like I've lost the spark we had, I still adore him and he's my best friend but I don't really fancy him like I used to, I don't crave him sexually like I used to either
My mum and friends say I'm mad to pass up such a genuine lovely guy - they say things are never perfect.
I'm coming up to 30 and feel like maybe this is it, I should be settling down and should be happy... what if the next guy I meet treats me awfully
I really am at a loss as to whether to stay or go, am I just being picky?

Thank you sooo much - really helpful replies

I disagree entirely that sparks aren’t real; or that nice is enough; or that everyone goes off sex.

For some people; that may be the case. Or some people might be happier having the stability of one person even if they don’t really feel it most of the time. I think some people even settle with someone they know they don’t love to avoid being broken hearted.

I wouldn’t settle with anyone who didn’t constantly make me happy; who I didn’t look forward to talking to and sleeping with and cuddling. Anyone I wanted to be with would have to make my life significantly better than being on my own; and just anybody wouldn’t do that.

Don’t settle.

I’ve just posted the exact opposite on my own thread. I’ve just realised I’m your boyfriend in my relationship.
I think my DP has stopped fancying me
Please let him go before it ruins his self-esteem as it has to me.
I’m also 30 and I would consider myself an attractive woman, but my DP going off sex has ruined me