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Hello and thank you for using JustAnswer. It is possible that your boyfriend may have some insecurity issues and he likes to see you jealous because that makes him feel wanted. Also by reliving he past as well helps to make him feel more secure about his physical appearance and other issues he may be insecure about. Overall this is a tactic he may be consciously aware of or subconsciously, but the fact of the matter is that he is doing this because of a deep seeded insecurity issue and this is how he manages it, albeit temporarily because he needs to constantly say these things to reinforce his fragile self-esteem.