My question involves criminal law for the state of: Arkansas

So my boyfriend had sex with a girl about 3 years ago. She ended up having a kiddo but told my boyfriend there was NOWAY he was the dad, and that she had been sleeping with several other men too. Now that the baby is about 9 or so months old she's threatening him for statutory rape. She was 14 or 15 and he was 17. Can he get in trouble? They dated, she gave him permission, heck, even the girls mom told them to just be careful and she knew teenagers at that age were gonna do that kind of stuff. Plus, she lied to him and told him she was 16, then after the deed was done it came out that she wasn't.. He can't get in trouble can he? She did give consent. Ugh, please help.