OMG!!!!!! what do I do now?

Ok so my sisters best guy friend on Friday was blowing in my ear playing footsie w/ me @ the dinner table and when my sis wasn't looking he'd slap my a s s or put his hand on my upper leg. Around 11 when I was in my room playing guitar he came in and he dat on my bed w me and started telling me I have pretty eyes and stuff like that. So we laid there for a while and he invited me to come over to his house this fridayy night @ 10. Im really psyched cuz he's Hot REALLY strong n a total Guido. My friend says I shouldn't go.... Y not? And what do u think??? Be honest.