Should I stay wit my boyfriend or get my 5th grade love back?

I love my boyfriend alot im in love with him but since 5th grade i liked this guy and he liked me but we never wanted to try anythin cuz we were bestfriends. And before he left to the marines we were datin but when he was leavin to the airport he left me. He said cause he though i wouldnt waite for him. So we both moved on. But Im my heart im in love with this marines guy. But i also in love wit my boyfiend i dont know what to do? Should I try to get my bestfriend back or just stop talkin to him forever?