School Friends no good after school?

Its so funny to think that through school you are so close with a group of people and as you get older and move away that group gets smaller. There were a handful of people who I considered close friends but have recently discovered that whereas I held them close the feeling isnt necessarily mutual. 

• My best friend for 10 years went AWOL and literally fell off the grid. Noone has been able to track her down or has heard from her for 2 years at least which has worried us all sick. 

• Another friend I travelled to her wedding because it was her - there was no parking and we ended up driving round for hours getting lost - I was late but couldnt miss it because it was her. However when it came to my wedding no show. Now i discover she is pregnant and not far off her due date.

• A relative I grew up with had a bf who tried to do something he shouldnt to me I told her and lets just say water is thicker than blood. She was a noshow at my wedding, didnt mention she was pregnant nothing until another friend mentioned the worst had happened (well over 3 months).

• A bridesmaid of mine - refused to sort her dress out for the wedding until literally the last minute, did nothing to help before, after or during, hasnt given the money I asked her for almost a year ago and has now moved to a different house and I heard nothing about it. 

None of them sent wishes to me for my sons 1st birthday when i wouldnt think twice on sending cards for their 1st wedding anniversaries etc it remains to see whether they will post for my 1st anniversary.

 Not all of them are bad there is one schoolfriend that I communicate with on a fairly daily basis and I have my uni friends who we all travel to meet up and talk often.

It does just sadden me that I have been friends with these people for a good 15 years and now we have no contact. I even contacted the one just after New Year and said look Im fed up of asking for the money we havent spoken since your wedding which was 5 months ago so lets just call it quits and she was like no i need your friendship blah blah blah I'll ring you in the week and that was what 3 months ago and still nothing. 

I know life can get in the way of things I am terrible for forgetting to get in touch but I always make sure birthdays anniversaries and the important things are covered with a card email or text which is more than what they can say. 

So it appears that I have school acquaintances but friends we arent close enough for that anymore.