Phil Coulson and Rosalind Price

Phil and Rosalind have been together for a while because of business and how Phil wanted Rose to tell him what was happening with Gideon Malick (since he is the head of Hydra) and what they were doing as Rosalind and Gideon were working partners. Rosalind didn't know one thing, that is that Gideon was the Head of Hydra and how she was under the influence that he was not working for them. Ever since then, she has been very close to Phil and the rest of the group so then they can take down Hydra all together alongside ex-member of Shield Grant Ward and old friend / head of Hydra Gideon Malick. Phil is known to be the one who wouldn't finish the job without a good fight and he would make sure that the people he loves are safe and not hurt. Since the day Shield found out about Ward turning out to be a mole for Hydra Phil wanted to make sure that Ward was killed by his own hand. There were multiple reasons for him so desperately wanting to kill him, one for turning his back against the team and the other was killing Rosalind in front of his eyes. That was the moment when he had enough of Ward running around freely and needed to be stopped once and for all.