What will you do if your male colleague keeps sending you boring messages?

Ignore him. After a long time, he will get bored and won't send it again. The more you tell him not to send it, the more excited he is!

Of course, maybe he keeps texting you to get your attention and have a good impression on you! If you have no feelings for him, just ignore it!

I think the best way is to stay put, hehe.