Alex is totally right!!!! They always do what Nikita wants and without question asked. It's time to question some of those decisions especially the bed ones.
Larissa is totally innocent in all of these and she saves Alex's life. Ari is a killer who help to planned to kill Alex father. Alex always has Nikita back and this time when Nikita had a chance to prove she has Alex back and she totally made the wrong call, chosen to save Ari other helping Alex. What Sean offer was the best option kill Ari with the chip and go and save Larissa.
I'm afraid what this will do to their relationship, Amanda is psycho bitch playing stupid mind games but she did make a couple of good points in the last episode and in this one. And both Alex and Nikita knows that but to afraid to admit it and now it kind of stuck In front of them can't wait to see how they get through it!!!!