<human>: Can you provide a brief rundown of the text in within 3 sentences?

We had planned to take my dog walking in the park, but I had really fallen behind in my online class. Working full time, school full time, and now a new gf (2months) has caused me to forget about my online class. I sent her a text before I got off work and apologized for cancelling. Everything seemed cool, but about an hour later she was walking in my house asking for me. After she had seen me working on the computer, she explained how she just wanted to say hi on her way to her sisters. I haven't had a real relationship in awhile and a lot of the previous ones have not been healthy. So, I was just curious if this is anything to worry about?
<bot>: M(24) cancels date with gf(22) for school work, but gf showed up anyway without any heads up.