Was I out of line?

So I met this girl on match a couple of weeks ago, we hit it off pretty well right from the get go, the same day that she sent me her first e-mail we ended up talking on the phone for about 3 and a half hours, then the next day I left to go on a week long fishing trip to Canada with my father. We continued to text / talk on the phone whenever I was able to and she continued to tell me she couldn't wait to see me and that she missed me, etc. I came back from my trip and immediately went and saw her that night. The date went great, we went bowling then ended up at my place and watched a movie and shared a kiss. The next night I got a call from her and she needed me to come bring her a bungie cord for her car door because it was broken and wouldn't stay shut, so I drove out there gave it to her and then her car died, so I tried to give her a jump, offered her a ride home, etc.
2 days went by after that with little to no communication from her. It went from us talking all day in the beginning, to maybe getting 1 text from her. I asked her if something was wrong and she insisted that everything was fine and that she was really busy and was spending time with her father (she found out he was told by the doctor that he had 30 days to live), I told her I completely understood and that if she needed to talk to anyone I was simply a phone call away (my mother passed away in July so I knew what she was going through).
After 3 days of hardly talking to her I thought I would leave her a comment on her Myspace page and try and cheer her up, thats when I noticed that another guy was talking to her, I figured it was no big deal and was probably just a friend. However I became curious and went to his page to see what she said to him (yes I know I am terrible for snooping around!) then I saw that she told him she really missed him and that the next time they were going to meet wasn't coming soon enough, etc. simply put it looked to me like she had some feelings for this guy and she was supposed to meet him the next day. So the next day I asked her what she was doing and she acted like she was totally trying to hide it that she was going to see this guy. Then I didn't hear from her again for 2 more days.
After 5 days without hardly getting to talk to her I had the feeling that I was simply lead on and played and that I was just a back up guy in case things didn't work out with the other guy. I sent her an e-mail stating that it didn't make sense to me that she had plenty of time to party (I checked her myspace again that day and saw that she was throwing a bbq) and hang out with this other guy but no time to even send me a text message / 2 minute phone call. In her reply she told me that she didn't even hang out with this guy and, once again, that she was just too busy and that she was sorry. I then got fed up and simply cut off all contact with her.

Now it has been 2 days without talking to her and I am starting to think that maybe I blew the whole thing out of proportion and was just being paranoid (due to past experiences). However I still have the feeling that I was being played, and actually as I write this she just sent me a picture of her. So please help me everyone! Was what I did justified or was I out of line? Sorry for the novel.