The first and second thing were all but explicitly shown in the trailer, and the third part is implied by the second.I am willing to bet some latinum that the next plot will be:
* Mariner refuses to believe Boilmer has a girlfriend
* Horribly embarrasses her and almost ruins the relationship
* Apologies and tries to make amends.
* Boimler and she break up for entirely unrelated reasons.
Anyone want to take this bet?
Not you, Quark!
So really it's just a question of whether Mariner is right to have whatever suspicions about the girlfriend.