Socialise desperately, do things outside the relationship so you both have fresh things to bring to it.
Date again?
Could you spend a weekend away each month?
Being around anyone 24/7 is going to get old,no matter how much you love them.
(I don't live with my fella, it's awesome.lol.)
((This isn't practical for most, I realise.))

I really don't think his interest in his friends is a bad thing.
But it could feel that way if you have nothing but him going on.
Where are your friends, and girlie nights?
Like all things worthwhile,relationships take effort and hard work.
We change as people over time. It's important to keep up with these changes and include our SO's where is possible.

If these things don't work maybe a couples counsellor.

Imho though, not all relationships are meant to last forever. However you expressed that you still love each other,so it seems there is something worth fighting for.

Good luck and all the best, hope it works out.