Is she using me or is she really over her ex?

Simple and short. She's using you, you deserve better, POST her. She's in a vulnerable state at the moment and she would basically cling to any guy now in order to just move on. Until she's ready for a relationship, she can come back to you. For now, tell her how you feel, tell her what she should do and let her go. Tell her you aren't going to be used, you're a human being with feelings too. She must stop being selfish... Just be friends and be there for her AS A FRIEND, until you think she's moved on. You will know when that time is.. trust your instincts. Don't take a woman's crap.*

She is, like some answers I've read. Your the "rebound" in all honesty. You needa get rid of her..

She still loves him, but she trying to move on with you.

Yea I think your intuition is right. She's not 100% over him. If you're just dating, maybe start dating other people. I always found it a waist of time if someone isn't completely devoted to you. To them you're just a "filler". She's going to keep denying it and I'm going to assume she's under 18 as well. So she hasn't reached that level of maturity where she can be honest with herself. If she can't be honest about her feelings for ex, chances are she is or will be dishonest about other things.

There's nothing worse than trying to date someone that is in love with someone who is not you. It sucks :(

if you have to ask then yes she is probably using you.

well if they dated for 3 years she probably knows his number by heart... I still remember the number of my ex from 2 years ago who I dated for a year. 2nd if you keep up the insecurities your going to push her away. and 3rd if your not comfortable in the relationship then end it its clearly not working out...

I think you already know the answer.

Yes.
When I was 15 I did similar stuff like this, knew I had that one best guy mate who was in-love with me and would do absolutely anything to make me happy, and when I got out of a serious relationship I was completely f***ed up. I lead him on with no intentions of being with him, nothing.
Now I'm not saying this is the right thing to do, I'm just saying that us girls are emotionally screwed sometimes, and it makes us feel powerful and desirable and in hope to take our mind off things and try to get over some people.
But by the sound of it she hasn't gotten over her ex at all.

Yeah I do think she is but you can't be sur. Tell her to stop writing on your wall. And take down the pic basically stop flaunting your relationship if she is still with you then she likes you I guess

I don't think she's using you, I just don't think she would do that to you and that she is genuinely confused about her feelings- maybe she finds comfort in you,but she definitely isn't over her ex just yet. She will eventually get over him though, it takes a while esp if she has came out of a 3 year relationship. Talk to her and tell her how you feel.