Don't worry, you're spot on, and I'm gonna do you one better. Harper Dearing. Dearing went to the top of the Most Wanted list by using flaws in electrical wiring to blow up several naval ships. The last episode involving him, they were to proceed with extreme prejudice. makes sense, right? So, then, why is the next scene Dearing looking at the news on a store TV display (do people really do that anymore?), and an FBI agent (female) walks up to him, rambles about "really makes you think blah blah", invites him up to her apartment, only to try to kill him there. First off, the way the conversation went, the woman should be perceived as being deceiving, because she just asked a 60-something year old guy she hasn't know to come up with her and get freaky. Secondly, and most importantly, this is Most Wanted number one. Walk up to him, and put a damn machete through his skull. Who gives a fuck what else happens?
You may be forgetting, and it's ok, because it was garbage, but in season 1 they DID date. The tension is always there anytime either of them is dating anyone else. I can't remember any other hint, but they're both always jealous of each other's dates.