A boyfriend thinking another girl is pretty when his own girlfriend is with him is not a good thing and so her being excited or happy about it is not realistic.
Consider the statement "I was not happy when my boyfriend told me that he thought the girl that works at the gas station is cute.". Based on this "I was excited and happy when my boyfriend told me that he thought the girl at the gas station was pretty." a true statement? Yes, no, or I don't know?