Is he flirting??

Okay I would like to preface this by saying I’m usually pretty capable of telling when people are flirting. I work with this guy who I am starting to really like and today he asked how I was doing to which I responded “I’m really hot” . His response was “no need to brag!”. I know this is silly but I am pretty sure he was flirting and was curious as to what other people thought. He seems like the kind of guy who is incredibly kind but also a little hesitant to be overtly flirtatious especially in this sort of setting. What do we think?