Their heart and mind are still stuck there, although they may deny it, and they can not handle being in a relationship. This can show up as jealousy in someone who has been cheated on in the past. In others there may be the comparison game such as: My ex did that too and it drove me mad.
Note: One of the largest ever recorded humpback whales measured in at 89 ft. long. These marine mammals are generally either a dark grey or black color with white patches on their stomach and knobs (known as tubercles) covering their head.
Gwydion Madawc Williams, Degree in Zoology plus a lot of reading. The Blue whale is the largest living mammal, and thought to be the most bulky animal ever. The African elephant is the largest living land mammal. But many extinct species were bigger. Paraceratherium, a long-legged and long necked relative of the rhinocerous, is often viewed as the largest ever - see Biggest Ever Land Mammal | Paraceratherium.