Okay so I'm 17 and a couple of months ago I went out with this girl named De'Xia for about a good 6 months. We broke up over the summer just because I lied to her about some things about my ex before her. And the only reason why I didn't tell De'Xia the truth was because that relationship ended bad and I wanted things to be special with her. Anyway me and De'Xia decided we might try again but not now you know, so we saw other people. I thought I moved on when I, just something snapped and I couldn't stop thinking about her. I'm single now because I broke up with this last girl I was dating so I wouldn't be hurting her and I can't get De'xia out of mind. But the problem now is that she has a boyfriend and he's all she ever talks about and they've been dating for about 2 months. Im crazy in love with her but I don't know what to do help please!
**Also I know I'm in love with this girl because I love what she looks like without make up how she acts like when with her, I know I'm in love with her because she's not perfect and it makes me so happy just to even see her.

Nope, nope, nope. You aren't in love. Proof of love isn't 'i love what she looks like without make up how she acts like when with her,. because she's not perfect and it makes me so happy just to even see her.'
That's teen infatuation. I suspect that you miss your water when the well runs dry, and don't miss it until it does. If you get her back, you'll run into the same problems as before. You sound like you could use a few more years learning some wisdom. Love comes with a LOT of time between 2 people. Love is way past the romance stage.