Gf [24F] got back with her previous partner after our first date before coming back to me [24M] after an argument

Current girlfriend when we had our first date it went well but then cut me off the day after to be back with her ex but then had a massive argument with him again and then came back to go on more dates with me then we eventually got together.

I know I’m a rebound, but am I fully cooked considering I’m just a second option? I understand you barely know someone after a first date