You're perfectly normal, let's start there. I think it's awesome that you're mostly fine, slightly nervous, and a tad turned on.
I don't think of them as primary/other-than-primary, but the first time I went to see FBF, when CBF knew I was leaving town to go do so, I was pretty freaked out. But 5+ years of waiting and NRE were good drivers... I stayed in touch with email (CBF could not have cared less...he was at home entertaining himself). Driving home, I was positively high. I was the luckiest girl in the world.
There's a thread in here somewhere, by KyleKat (I think that's his nick), where he talks very eloquently about his feelings during his wife's first venturing out. I recommend that to you (sorry, I'm not so great with the researching and the linking).
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who now lives in a house far away-with stairs I can't climb)