Parks and Smith

Is it ok to be in a relationship with two people at the same time?

Zorell Wilson is a solider in the us military, she has been selected to join the special forces. She has a hard time settling in because she the only black women in her unit, other then her commanding officer.
Captain Eric Smith is the instructor of Zorell's unit and the only other black person. He's ruthless, controlling and selfish but somehow zorell caught his attention.
Now Dominic parks is in zorells unit, they notice each other on the first day but they get off to a rocky start.