Relationship with a friend?

Well you seem to have more to gain than loose here. Sure the worst that could happen is it ends in an ugly breakup and you end up hateing eachother , but thats not to bad better to have hate as a reason to not be friends anymore. Maybe your odds are real good here and you will be together forever wouldn't that be wonderful! Being best of friends with your life mate is very healthy. Best of luck to you and him.