I feel terrible BUT....

I feel awful about my feels! The other day my boyfriend (of ten months) threw a party at his house, and invited the new exchange student.... Wellllllll see the student is very attractive and funny and nice! Before meeting him I was sure I wanted to spend the rest of my life with my boyfriend but (since he's my first real relationship) I wonder if maybe I'm missing out by dating more? It's not like is date the foreign kid or anything but I felt looser because my boyfriend is working through depression. Am I terrible..? Should I really chnage what I think? Because he used to always capture my attention and make me feel weightless until recently...