How to deal with a difficult male co worker?

My male co worker is a fuckboi and womanizer. He is married but is good with flirting so has female friends. He never does any work and always relies on me to do tasks which I do because If no one does the task it fails and its important to me. And sometimes he is good I will give him that. But I helped him too.

But sometimes he is just toxic, he knows I am single and always makes fun of it. Makes sure to let me know all the 20 different girls that are dming him. Tells me it's a joke. But its effecting whatever little self confidence I had and demoralizing my work.

How to deal with a difficult male co worker?
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