17 year old dating a 12 year old, is it wrong?

I'm a 17 almost 18 year old guy, and I love a 12 year old girl and I know she loves me too, but would it be wrong to be with her. Soon I will be 18 and she will be 13 in about 3 months. Idc if its against the law, but would it be wrong moraly to be with her?