What does it mean when your ex girl sends you pictures via cell phone?

I met my ex girl about 2 years ago, we started dating within two weeks of meeting each other. we dated for six months, it was an intense relationship, she broke up with me because I was too much into drugs and she couldn't handle it anymore (been sober since me and her broke up 1 1/2 years ago) but she still wanted to be friends and we've kept in touch with each other since then but I tried recently to get back with her and she said no because I got too "attached", I think she meant jealous because I did one time ask her where she was and what she was doing in an angry way, so I stopped talking to her and she called me saying that I treat her different and I just told her I treat her like any friends of mine, but now just recently she's been sending me more texts asking me what I'm up to or just small talk and sending me pics of herself and some are flirty sexy lingerie pix, I think I messed up cause I sent her one of me shirtless last night, but whatever I guess. yeah just wanted to know if she's messing with me or just what the hell it all means?
What does it mean when your ex girl sends you pictures via cell phone?
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