Is it normal to constantly worry about whether we'll be together

we've known eachother a little over 3years now. our families know eachother and we've been really good friends. the first year we met we called ourselves dating for an entire day. then i dumped him [dont ask y i was akid] 2years later we find out we go to the same school p.s we live next door to eachother. so now that we see eachother he begind to flirt a bit. a week later we're friends on fcbk and he sends me his number .we txt a couple of hours and make small plans. a week later were official another week later he loves me another week later we have sex. so yeah hes the typical joc football player hot everyone loves him including me. and he loves me too y am i so insecure is this normal and he hugs girls ALOT at school and he hugs me as well sometimes we dont speak but it isnt a big deal . im just tired of obsessing woth this insecurity was it a hit and quit because he tells me constantly to stop thinking this way i just cant what should i do is this normal HELP ME PLEASE i stayed home from school today to get some help from you guys so please