What is when a guy says no chemistry?

When a guy says "no chemistry," it typically means that he does not feel a romantic spark or connection with the person he is dating or interested in. This can be due to a variety of factors, including differences in personality, lifestyle preferences, or simply a lack of physical attraction. It is important to note that chemistry is a subjective and often intangible feeling, and what one person perceives as chemistry may not be the same for another. While it can be disappointing to hear that there is no chemistry, it is ultimately better to be honest and upfront about one's feelings rather than leading someone on or continuing a relationship that is not fulfilling for both parties.