My Boyfriends Mother

I don't even know where to begin. We have dated for 4 months, then broke up and recently got back together after 2 years. 2 years ago my brother and his sister also broke up and have not gotten back together but yet she never did what I'm about to tell you to my brother. I am 15 and my boyfriend is 14. I get very pissed off whenever she saids I can come over and then changes her mind when I'm already in the car. Like it irritates the fuck out of me (Excuse me). Whenever he comes over, most of the time he has to walk to my house because his mom doesn't want to take him. I haven't been to his house in a while and it isn't fair. She doesn't have a job so she's always there, then she wastes my time. I'm just sick of it...what do I do?

Update: I really don't need all of the rude comments right now. I'm already pissed as it is. If you're gonna comment something rude, don't comment at all.