I have to vent about "That friend" who wants to work out with you...

I am not a fan of working out with people because I like to do my own thing & I hate to be slowed down. But, if someone wants to work out with me I will never tell them no because if I can help someone into a healthy lifestyle change then I'm all for that & l'll support them 100%. I'm not a trainer by any means, but I am happy to share what I do know. However I have this certain friend who joined my gym & keeps saying they want to work out with me. So I told them that's fine. I'm at the gym by 7am every morning, be there & I'll help you along. They came twice, were late both times & kept making promises to come other times but never showed up. They whined & complained that 7am was too early for them, hey if you want to work out with me you are on my time. I'm doing you a favor, so don't ask me to change my schedule around. So now this friend who hasn't been to the gym in weeks even though they tell me a few times a week that they are coming & never show up. Asks me to go to the gym later in the morning since I work a late shift today & it won't interfere with my work schedule. I agreed to do so & told them to call me when they are on the way to the gym. So we were supposed to meet at 9am & where are they? No call, no show. But I changed my workout schedule to accommodate you?! And you don't show up or even let me know you aren't coming? That's really messed up & I'm really pissed off. I have no patience for people like this. It makes no difference to me if you go to the gym or not, I will be there working on myself regardless. But don't ask me to do you a favor & inconvenience myself to do it & then not even come. I'm done, she's on her own now.