What does it mean when a guy laughs a lot when he is with you?

Anonymous
There is this guy I work with, and he always seems to be very happy and in a good mood around me. I notice that he also laughs and has a good time with other work colleagues, but not as much as he does around me. Whenever I talk to him, often he laughs like I'm the funniest person ever. One time I forgot my lines when I was working together with him and he laughed so hard his face turned bright red and he kept saying 'I won't tell anyone haha'. Usually after I make a mistake or say something wrong, he laughs like it's the funniest thing in the world

When we are both talking, he will have this big grin on his face and sometimes mid-way through our conversation, I notice him blushing and sometimes he will go bright red and leave the room. He also blushes whenever I laugh and asks 'what's so funny?' in a playful way.

Just recently I heard from one of my other coworkers that he was talking about me to them and he apparently said that he enjoys working with me and that I'm cool to be around

What does it mean when a guy laughs at everything a girl says? Is he making fun of me?
What does it mean when a guy laughs a lot when he is with you?
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