Thread: Ex's Sister on my Lawn

Can someone help me interpret this dream I had? I had this dream last night (April 7th, 2013). Before I type the dream I'll give some info.
My ex and I broke up around the holidays because I found out she was "seeing" someone else. We've been together 4.5 years and moved in a year and half prior to our breakup. My ex's sister, whose always been trying to break us up since the beginning, and my ex's best friend, encouraged her to see someone else because "I was just her 1st BF" and she was attracted to him. Even though she stopped seeing the guy before I broke it off, shes been seeing him for at least two months, and having lost my trust for her broke it off. After we broke up, she texted me for awhile saying she was sorry and she still wanted to talk and maybe get back together. I said "no way" at first, but after careful consideration from her intuitive aunt I decided to start talking to her anyway, but I had no intention of ever getting back with her. Even now I don't want her back as more than a friend. After a month of texting she decided that she didn't want to talk to me anymore. I asked her why and she said "cuz I need space and I just want to be acquaintances with you." After literally a month I started thinking about her randomly non-stop, which usually means something - usually bad - is going to happen or is happening to a person I know, so I texted her just saying hi. Her brother told me she didn't want to say anything cuz shes still not ready, so I just decided to cut her off completely and discontinue asking how she is, texting, her, etc. It's been a week after I made this decision. As a side note I'm still grudging with her sister and friend.

Our relationship prior was good. She had jealousy issues and insecurity issues. Also very sensitive to negative emotions and would feel overwhelmed if we got in even minor arguments. I still cared about her and we had the same interest and beliefs.

About me: I am 27 and studying martial arts and am close to my black belt. I am currently attending college for computer science. I also run, lift weights and draw.

(Sorry for the top part being so long)

=================================DREAM FOR INTERPRETATION=========================================
I went outside to get the mail and I saw my Ex's sister walk to my front yard, and walked past her. The sky was cloudy and the clouds were silver. I asked her "do you need something?" and I felt angry yet controlled. She told me in a nice way with a smile that she wanted me to help her cross-train. I felt surprised she wanted me to do this. I got the mail and went back inside the house, then I shut the screen door. I could still see her through the holes. I told her that I'm not sure yet but probably not. I felt mad but not as before, but somewhat intrigued by her request. Then she told me that it was time for me to bury the hatchet with my ex and I should talk to her (or something to that effect). I told her that I wouldn't do that because she lied to me and I don't trust her. I became more upset again and hurt thinking about my ex. She told me that my ex lied to me because I lied to her when I first met her (I told my ex when we first met that I had GFs before I met her but I didn't. I was trying to impress her but she found out and wasn't), and after she lied to me she keeps making up more lies about what she did to me when she talks to her sister about me. Then I woke up.