I Can't Sleep When I Have Too Much On My Mind

There are things I can't talk about on here, although I use this platform mostly to let out sorrow. Do you ever feel like when you tell a weakness to people they will use it against you just to get what they want? Well this happens to me a lot lately and it's slowly turning my heart cold, but I'm trying so hard to forgive. I'm constantly being pushed around... when is it time to say 'enough' and call it quits?