Guy I’m seeing wants me to date others?? Help??

Hi I’m 25 and the guy I’m having sex with continues to give me advice about how sex with other men should be and how other guys may not compare to him. I lost my virginity to him a month ago. He also says I should wear tight clothes to attract other guys and during sex once he said something about me and other guys fucking.

Please help me I am so confused. Why is he talking like this? Is it a test? Does he want to stop hanging out? He told me he is only sleeping with me and no one else. Should I ask him??