Why would a person do this?

We broke up like 3+ weeks ago. On her terms. She states that she wants to be friends. I was like whatever. Ok. Next day she starts texting me for advice and help for a job interview. Plus, she asks if she could use me as a reference but as her assistant. Being a nice guy I did. Anyways, she gets the job and calls me but she is not too excited until it becomes official. Then later on that week, she meets me for lunch. Again, I am like whatever. Although she did look great.

For 4th of July weekend I went on a vacation to San Diego. Yet, she still calls me and leaves a voicemail. Then sends me an email asking for a favor to buy some things for her on Amazon. She said she would pay me back. Being a nice guy. I followed through with the favor. Later on in the week. She calls me stating that her start date for her new job got pushed back. She sounded kind of sad. Next day her item from Amazon comes in. I dropped it off for her. I figured that would be the last I hear from her. But I gave her a card to congratule her on her new job.

Later that weekend. She texts me again for another favor. Asking me to buy some items for her on eBay and that she wanted to hang out a bit the next day. Again, being too nice I do it. Unfortunately couldn't hang out because I had to fly out of state for a work assignment. During the trip, I just decided to call her and ask her why she is asking for me to do these things. It seems kind of odd. Since, she could do it herself. Also, kind of impersonal the way she would ask. She didn't like the impersonal statement and tried to flip it on me. However, she later calls and apologizes. I bluntly ask her why is she asking me to do these things when she could do it herself. She asks as favor from one friend to another. That she she is sorry for any confusion and that we are just friends. The thing is I am stuck with the items I bought for her. What do I do now?