What do you guys say about this?

So, to start with this. I am 17 years old and there's this my ex-girlfriend (16 yrs) I met her when I was 13 or so and we used to be a couple back then at younger age. We broke up because of my idiotic actions and bad behaviour against her. I've had a relationship of almost 3 years and alot of girls at my place for the night but still I have managed to care for her, so am now asking what the hell should I do..? Yes, I know its a kind of stupid to ask help from here but it seems to be easy to talk behind the screen for ppl that are willing to help, and no, this isn't going to be my last conclusion. The question is; should I tell her about this situation of mine or just try to hang on with my feelings and watch other guys to hook up with her..? Beforehand anyone gets to answer I'm saying thank you to everyone that replies this thread :-)

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I think the fact that you included that picture answers the question for you.