@matt1141,
What does a 'day to yourselves' look like when it's long distance? Is it a fourteen-hour text and phone call session?
Since it isn't, there is time out for both of you, yes? She spends her
not with you time with another guy, but there is no sexual interest there. However, there is a different concern, that she is spending time with someone who seems to be a bit self-destructive.
Understand that your own feelings are wrapped up in this. Saying on one hand that you are concerned for her, and on another that you want her to yourself, at your beck and call, on every single Saturday, results in a helluva mixed message.
You might want to consider that the talk about being concerned about the company she keeps is really just window dressing and a cover for the real desire you have, which is for her to be available on tap to you on Saturdays. You might have some jealousy, too, or at least envy. Envy that she's going out for a good time every weekend and you aren't. And maybe some jealousy that her gay friend likely knows any number of straight men.
Long distance relationships are stinky for a lot of reasons, and this is one of them: differing expectations.
Time for you two to have a talk about what you really expect out of what's going on, where you see yourselves, etc.