It's normal to feel slightly jealous... but right now I see
you're being insecure.
Just because she's entering poly doesn't mean that she'll instantly
cheat on you and mess around with others guys whom you perceive as
'better' than you. It's only inevitable that she gets to know other
guys while in school. Just see it this way: if you do go to another
school, you'll definitely get to know other girls as well
right?
In a relationship, both parties must learn to give and take. You
can have your female friends, but she can also have her male
friends as well. You can't expect her to stop getting to know other
guys in the course of her studies just to suit your own personal
feelings.
