Ruth Paine was in a lesbian relationship with Marina Oswald, IMHO. If you read the "love" letters it's fairly easy to see that if you read between the lines. In addition, she never remarried and as we know, the Dallas police carted off her lesbian film collection and a projector that she argued about them taking.
The third "love" letter that she never sent to Marina, she tried very hard and succeeded to get back from the Warren Commission as I recall.
Now, spies do sexual things all the time and Marina, was certainly highly sexualized from what I understand. The lesbian relationship could have been a relationship of convenience for one or both. It could have been real or part of one of their or both person's job. Nevertheless, there is so much more to Ruth Paine than has been disclosed. "Forgetting" the higher paying baggage handling job offer for Oswald and tossing away the info has always been suspicious just on its own IMHO.