Is he jealous of me?

When I talk about my crushes my guy friend teases me or even starts insulting me. Once I said that my professeur is young and sexy and he said:,, And I? I am not sexy? ". He also insulted me by saying:,, you want to be fucked by him in your flat ass?". The other times he said that my other crush is too clever for me and he won' t be with me for a long time, when I found a boyfriend, he said:,, he tried to use you, good luck". Why?
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What do you think?
Is he jealous of me?
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