I don't think he really knew what love was. I think he "loved" his wives when they were doing what he wanted, so for instance, while Catherine of Aragon was still of childbearing years and actually getting pregnant he "loved" her. He was besotted with Anne and more so when she was getting pregnant but she was too independent of mind for him and It's possible that he knew Jane Seymour was pregnant at the time of Anne's execution given that she gave birth in October, five months after the execution. He "loved" her because she gave him his much wanted legitimate son. Before the birth of Edward, in the summer of 1936, there had been plans underway to legitimise his son by Elizabeth Blunt (Henry Fitzroy) but the young man died, making the arrival of Edward even more important.
There are stories of how much he loved Jane and mourned her but he was back to normal very quickly, as noted by those around him at the time. Anne of Cleves was not "loved" by him but in a way, she may have been the woman he came closest to loving in a more platonic way as they remained on very friendly terms upon the annulment of the marriage and he looked after her with money and property. It's long been claimed that he annulled the marriage because the painting of her was not accurate and she was "ugly". Maybe he did say that but accounts of the time say that the painting was accurate, which in my mind makes her more attractive than the other wives. Also, if Hans Holbein had tricked him with a painting it's unlikely that he'd have maintained his position, so the "photoshopping" is almost certainly a bollocks. Can't really figure out why he divorced her but by this stage he was often impotent, so who knows.
Catherine Howard was an old man's cock leading his addled brain and as we know Catherine Parr was a nurse to look after him who absolutely did not want to marry him but was in no position to turn him down.
By the last decade or so of his life, when a lot of his divorcing and beheading took place it's thought that he was suffering from some sort of brain damage. He was unconscious for a couple of hours after a fall from his jousting horse in January 1536 and that wasn't the first head injury he had. If he hadn't started out as some sort of narcissistic rage monster, from 1536 he pretty much was a nightmare.