How Do I Explain To Them Why They Aren’t In My Wedding?

I have 3 bridesmaids right now. I asked my child hood best friend, my best friend (that stuck around) from middle/high school & my work best friend. My fiance wanted things even. So he asked his 2 best friends & my brother to be his groomsman. 3 & 3.
If we would have got engaged & married 2 years sooner it would have been a different story.
I had 2 best friend from high school. Friend #1 She is always about herself. To be honest the last time I saw her was xmas 2009. & it wasn’t planned we ran into each other at a bar. (she lied & said she wasn’t coming home that weekend) We have texted/facebook messaged a few times (under 10 messages since then) Now she is coming back from college. She has been spamming my facebook & cell phone with message to hang out & get together ect…She has never asked wedding plans. Or asked to see my ring. Didn’t show up for my fiances fathers funeral & forgot my birthday last year. My fiance hates her!
Friend #2. She has been my best friend since Kindergarden. We used to do EVERYTHING together!! But she got pregnant right out of high school. To a super big druggie loser. Got married. To be honest she has to hide that we talk from him. (I’m the only 1 that asks why the hell are you working 70 hours a week while he sits at home or you takes your car & you don’t know where he is for days at a time!!) He has grounded her from me!! So we rarely talk. She told me that she doesn’t care & we are allowed to talk again after about 9 months of only talking once. (threw text)
Both are hinting around NOW (6 months before our wedding) who my bridesmaids are. & asking wedding plans. ( friend #1 isn’t invited to our wedding)
Should I even bother with either relationship? Let along explain why they aren’t bridesmaids?