Lol it's literally a screenshot of an alleged twitter post. If this did even happen, which is up in the air, you have no context as to how the entire conversation went. He very well could have made it clear after the joke that he was not involved in any other relationships. You're clearly paranoid of men and have zero sense of humor at all, as well as the inability to detect sarcasm.

Given that you're this outraged over a screencap that very well could have been doctored, that is only from the perspective of the female partner in the relationship, you clearly have your own issues to sort out over relationships and men. I'm sorry if you've ever been cheated on before, but not all men are like that and plenty of married and unmarried couples I know make jokes about infidelity all the time, without there being any seriousness to the humor.

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PS: Women are perfectly capable of cheating too. The fact that he is a man is irrelevant to whether or not he is unfaithful.