I swear the whole making friends situation is never ending since we moved here and its really starting to wear me out

For those who havent caught any of my other posts -
My hubby is military, we moved to Townsville 6mths ago and I thought Id found a great mother groups to attend, only to find it wasnt the case. Decided to stop going due to some immature behaviour I witnessed and as a consequence one of the attendee's (who has since proven to be a bytchy troublemaker of the grown-up kind) has it in for me and life has been lonely and difficult ever since Im not used to not having a big group of friends and although I have one I see here and there, she is part of the first group and HER life has been made difficult because she is still friends with me. A few coincidental incidents of her and I having plans interrupted by them making plans after we have and they know she is too nice not to try and do both to keep everyone happy, have occured too which hasnt made it easier as I get extremely po'ed with the immature behaviour and find it hard not to skitz it at them even when it may be a case of them not knowing (though I find that hard to believe as its always been after her and I have made plans via public forums or its been broadcast through the grapevine and suddenly troublemaker comes up with "Oh we want you to hang with me/us on that day/time too" *sigh*)

A few others in the group have made noises about building friendships and while I get along with the odd few really well and can see great potential for it, I have two issues with doing so -
a) that I can trust them to be discreet and honest/loyal to me even while being friends with said troublemaker. I would never make people choose but I have to look out for my own interests as well and while we might become good friends, she was friends with them "first" and I dont have alot of confidence that they would make a decision based off behaviour and example, not who's known who the longest
b) I dont have the energy or time to engage in a tug of war over them with the troublemaker because she gets jealous that they spend time with me too, and it WILL happen eventually just like with the first friend. Plus I get the guilts just thinking of their lives being made miserable all for being friendly with me.

But Ive found it hard to slot in with other groups because their already well established (and Im a bit once-bitten-twice-shy now) and we could possibly be moving in July anyway so trying to find completely new people to befriend now seems pointless. I need more than just one friend to have adult conversations with though and the kids are struggling with no friends of similar ages to play with regularly (esp my 2yo apart from daycare) and its impacting on my 2yo's behaviour so much so that Ive decided to send him to daycare for TWO days a week to give him the level of social interaction and playtime he needs with other kids. Which leads to yet another case of guilts.

WWYD if you were me? Ive tried to just keep it cool but I find myself really enjoying the company of the others and dont want to always hold myself back for fear of causing more problems or becoming attached to someone/the kids becoming attached to the other kids, only to have it all blow up in my face. Its bad enough 'losing' friends through moving alot without directly putting myself in that position. I couldnt take it.

If you got this far, thankyou very much for reading