[DimHalo]

i was asked to give my opinion in this thread so here goes:
First, if she knows your password that is fine... i know my friends/boyfriend's passwords.
Second, although she should not be checking up on you (eventhough she knows your password she should respect your privacy)
However, since she did find something out you should be open and direct with her... she may have a hard time accepting that sending the picture is innocent
...This is because girls are timid and fearful in nature. Especially if she has low self esteem (which you said she does). Her first instinct will be to get defensive.
You probably shouldn't be sending pictures over the internet...just causes lots of problems. Living in a virtual world creates issues that become too complex to even dive into. I'm not saying that is what you are doing by sending your picture to someone. However, it can escalate.
Finally, if you don't have any interest in the girl you sent the picture to, why not send a picture of you and your girlfriend? Are you not proud to be with her? Or do you want to hide the fact that you are with someone? I don't know the whole story so all that could be entirely wrong. But, these are things that a girl will think about when finding out something like that. I may have more to add later, but that's all i've got to say right now.

PS: talking it out is the best thing to do