Is this because of Kelly (Coelasquid) or because you like Mass Effect?
Kelly cut her hair for reasons totally unrelated to Jack. (Though I admit it’s a bit of a perk for me.)
Jack has been my Mass Effect waifu since I first played the Purgatory stage in 2. For me, her aesthetic, style, personality, story, and development surpass the other LIs - and most of the main characters, really - by leaps and bounds. And 3 only cemented it.
The only other LI that comes close for me is Tali, or Samara if you want to count her. I also admit to being heavily sympathetic to Cortez.
And I’m not saying Jack will have competition if it becomes an option with the Omega DLC, but Aria is my real #2.