Will somebody please tell me what to do?

So im single and there's been two girls I've been gettin with now one I really like alot (girl 1) and the other (girl 2) I also like but she's way more into me. Now girl 2 asked me why her and I weren't dating and I couldn't tell her it was cause I wanted to get with other girls but I had some long lie because I just wanna stay singgle but in that lie I told her she was the only girl in my life. Now like 10 minutes ago I told girl 1 what's really goin down cause she heard a bunch of rumors and I didn't want to lie to her cause I care about her alot. Girl 1 understands cause her and I aren't dating but things are over between us until im done messin around with girl 2 but even at that getting girl 1 back would be a challenge. What should I do? Stay with girl 2 and just play her like a violin or tell her the truth and try and get girl 1 back? PLEASE HELP!!