one lady at work says i keep her sane
On the off chance that I'm that lady and you're one of my colleagues : don't ever change, you're absolutely lovely as you are and you're being a bit irrational.
I think a lot of people are really shit at staying in touch. Plus people's lives are very busy - if someone has a job and kids (let alone any kind of interest or hobby) then it's very easy for their diary to fill up months in advance.
I once lost a friend in the following scenario: she got a new boyfriend and became really flaky. Cancelled repeatedly last minute (costing me money, more than once), made up stupid lies about why she wasn't coming, asked who else would be coming before she committed, etc etc. After a while I figured she couldn't want to see me that badly, and I cba with this, so I stopped sending invites. "If she wants to see me she'll call." She never did.
6 years later I bumped into her at a wedding. She wanted to know why she'd suddenly been "cut out of the group". She hadn't been, she just never bothered to make the first call. And she lost quite a large group of friends as a result.
I'm not suggesting that what is happening is your fault and you never make the first move (although maybe that's the case?), more trying to illustrate how rubbish lots of people are at organising social stuff.
I also think that finding a really good friend who you properly click with is at least as hard as finding a really good partner who you properly click with. Finding people you get on ok with and enjoy spending some time together is easier, but I think those friendships take more work to maintain.