Just what should you do ? Hmmmm... You know if you have unprotected sex you can get pregnanty but thats the least worst think that can happen, even if I hope you are not ! Yess... It sounds that he just came by for a booty call or so sence he doesen't spend time with you and sence you know he haves a baby-momma ???? What can I say... he is soo jung just like you... I would not mess with hem, but do take a pregancy test and if you are not pregnant, wich I hope and pray, hope you learn !
Belive me when you are that jung (16) "love" comes and goes, you'l see in a few years you will laugh about it

promisse, I dated this guy when I was a teen and I thought I loved hem

I guess I did'n know than.... But I am telling you if it's love it's forever and you will see, you will remebmber this I promisse .... Just take it easy and try to stay out of hes way unless you are pregnant, wich I really hope you are not .