Ok. But isn't it a trope in and of itself to put her in a relationship? Why not have her do something else to show us that she can act independently of other's expectations? I don't know...take up salsa dancing or something? Yes I'm being ridiculous but I hope that gets my point across.
Yes, it is a trope and as I said a little ways back, an easy and convenient one to signify that Seven has completed her four year course in humanity and as proof, now has someone to share the experience of her hard earned gains, as well as perhaps being an intimate ally in whatever depredations she might face in dealing with Starfleet. She was shown putting into practice the lessons she had learned, in her own way, but within the straightjacket of what the producers clearly thought would be a palatable and expected symbol that she is now one of us.