Just b/c you got a kiss on the cheek & a hug does not mean that she is reconsidering - it most likely means that she FEELS guilty. I think for most of our WAS, it is not that they don't have feelings for us and feel badly that they are hurting us - but that they don't THINK they should be with us any more because of x,y,z past history etc. The only thing you can do is change those things & you have to be in a good frame of mind in order to do so. Rather than asking your buddy to watch the girls to go check up on her - why not ask your buddy to watch the girls so you can go out and have a good time yourself?
