what should I do?My DOB is 12-28-78 and my BF dating off and on for 6 years' birthday is 10-18-68.

Your present relation will work out much better for both of you if it is long distance. Living together may lead to disappointment as both of you possibly will take each other for granted.
You and your boyfriend 10 years ago had a lot of acceptance for each other. He may have been magnetic in his personality, but there was still something missing. Ask your heart how much he has tried to pursue you in those 10 years.
If you are open to starting new, the door for your possibilities just unlocked. Make sure you consummate your earlier choices without burning any bridges. This will liberate any future guilt and you will be able to move ahead with confidence.