Ozcar, this is definitely cheating. I suggest that you try to restrain yourself from doing this again in the future because, damn. Eva took you back before, and you were dumb enough to cheat again? Keep your hormones to yourself and Eva. Besides, that guy has a point. She could find out easily by this topic that you did this.
Okay, enough crap from me. Bottom line, here's my opinion: It's cheating, shame on you to do it twice on one girl, shame on her to have accepted you back for the first time.