It'd be one thing if she was just there as a love interest, but both had distinctive arcs to deal with on their own, and they dealt with said arcs before any romantic interest was bought forth. Both exist independently of the romance arc but are driven to be together given their back stories (Jack's isolation is such a consistent and tragic part of his characterization it makes sense to address it in the finale). That's not forced.
Then again, Tumblr will call anything romantic between a man and a woman forced because they're a bunch of snowflakes.