This maybe long sorry..
I have a 'friend' I met through my DD I have somehow landed my myself in a position where I am picking her DD 3 times a week from school, at first I didn't mind so much as I thought she was busy and she said she will return the favour. This has only been returned once. She practically invited her dd and younger ds for tea at mine a few weeks ago. I am such a walkover that I went along with it. Today 'friend' put me on the spot by coming to my house and asking if I could pick up her DD again as she urgently had to deliver something... Me being an idiot agreed. While at the school gates another mom approached me asked if I was picking up friends DD I said yes and she replied that 'friend' was sat at her house looking after her toddler and baby so she could do school run and keep the kids dry. I feel so pissed off and used that she lied to me and my toddler got soaking wet to.
Instead of taking her dd to mine as planned I took her back to 'friends' house which wasn't the plan as she was meant to be collected from mine. At her house her DM was sat there nice and dry with the you get DS.
I am a mug. DH says just say no but I seem to be incapable of doing so. This isn't the only 'friend' that I feel it's very one sided I think I must attract them! I somehow ended up looking after someone's child while they were at work for 6months. Another where I looked after her kids while her and her dh went for a meal. They came back at 1am..