Apparently guys here don't realize that, no you aren't her second choice, her friends were her second choice and she fell back on her #1 choice. Now that being said if you live together there is no issue taking a few hours away from each other, for there is always tomorrow or later in the night. If she loves you she should understand that you shouldnt ruin your friends plans like her friends did to her and that you still love her.
Maybe I have bad morals, but I feel like this happens to me ALL the time. My parents miss me because I don't live with them anymore (and yes I love my parents), and I always do my best to see them for as long as I can without being with them 24/7 and still live my own life. But I always feel like they want more...