Guys treat me like **** bc im not so pretty?

why is it everytime i date a guy they eventually treat me like **** after like 1 month? they end up calling me names like a drama queeen,fat,bitchy, but in reality the problem is not even me, its the guys who meet me from online personals and then they dont like what they see in person and its like they want me to settle for some bullsh*t no call or text to top that off calling me names? meanwhile theyre probably trying to get something else gng behind my back. i mean i dont get it!! sometimes its hard to know if its my looks these guys are really complaning about or if its the fact that im not allowing these men with bad alterior motives use me to get what they want. i wont settle for maltreatment so let me know what are your thoughts, thanks!!