What does "affair" mean here? Doesn't it mean "liaison"?
In the case of this video, "affair" is combined with "love" to mean a romantic relationship or sexual liaison. (Remember that liaison can mean different things). When the speaker says "unrequited love affairs," we can understand it to mean one-sided (unrequited) romantic relationships. In some cases, "love affair" can mean an enthusiastic love or passion for something, like a hobby. Ex: The celebrity has been the center of numerous love affair scandals. Ex: My grandmother is known for her life-long love affair with gardening.