My 10 year old niece just told me she has a boyfriend. What do I do?

shes 10 not many 10 year olds know anything that could be bad for them to do at that age. she "loves him" cause its her first boyfriend. what the worst they can do hold hands maybe a peck on lips? i dont see a 10 year old having a make out section or , or anything else that your worried about. if u just keep her secret and everything she might keep telling you stuff and asking for advise. if she ask or starts any of that other stuff shed tell u if she trust you. then if it comes to that tell her mom, but until then nothing bad can happen at the age of 10 they are not educated enough to do anything.