my problem on.I'm 17 years old,a student,a virgin…… he is 28

my problem on.
I'm 17 years old,a student,a virgin…… he is 28years old.we met on the Internet.I love him,he said he love me too.He has no gf,no wife.we have had some close behaviour……such as KJ.He want to ml with me .but still enter alittle,no blood.I say l love him because he can bring a lot of positive influence to me about my study.but about "ml",i am very confused.i don't know how to do next.l use English not because my English is good,just because i'm shy speak in Chinese.if there is some mistakes,do not mind.Thanks!