Advice on a mistake I made?

Basically, my gf broke up with me in about march. It was hard but in the end I made up a girl to sort of make her jealous, yes I know it's sad and strange but I texted her pretending to be this girl... I never told her it was me, and we ended up getting back together in May... At times I've brought this girl up saying this girl had text me and stuff and every time it ripped me with guilt but I was too afraid to tell her in fear of losing her... In the end, a few days ago I told her, I told her I was a dick and that I was forever sorry which I truly am. I told her I respected her to much to let it carry on any longer, and that it was a big mistake, I was childish and immature... Now she said she wants some time to herself to get her head straight and that she didn't know how to react or talk to me anymore, but she then said we'd probably still be together when she's sorted her head out... Now don't get me wrong, what I did was wrong in many ways, I was desperate and immature... But I've never mistreated her or lied in the past, my everyday goal was to make her smile, her smile made my life worth while... But she's lied to me before, she was secretly talking to her ex and kept lying to me saying she hadn't spoke to him, she's had chance after chance from me and I'd keep giving them her because everyone makes mistakes... But now I'm in the wrong, idk wether she's using this against me? I know I'll get hate on this a weird mistake, but any helpful advice is appreciated

Thanks