When it's appropriate

After running into my stepdaughter today she started texting me. Now anyone that knows me knows that it is very hard for me to ignore a text, I just find it rude and I don't like being rude, especially to my stepdaughter. So I would just briefly respond to her. Well she said 'I might come over this weekend' and I thought wow did her mom actually say she could? So I asked her if her mom said it was ok. She hadn't asked her yet. Well I guess once she did I get a text from her phone saying it was her mom's boyfriend and that he would let me interact with her when it was appropriate...... First of all HE will let me? I'm sorry last time I checked your were the mad who hated her up until her father passed away, Need I remind them that I am the one who has been raising her for the past year! and #2 when its appropriate? how is it not appropriate right now? They are complete lunatics and if i could get custody of my stepdaughter I would. But the worst part is I can't even say anything. I just have to sit back and keep my mouth shut if I ever intend on seeing my stepdaughter again. It just makes a shitty day even worse. My anxiety and irritation level are through the roof right now. Brad would be flipping his shit if he knew what was going on. I mean I know he knows but he would be beyond livid if he were still alive. UUUGGGHHH I don't know if I should or want to scream, hit something, cry, or just curl up in a ball and disappear.