i need help

so i’m currently a 17 year old senior in high school . so this guy from my work asked me to prom, with a cute dinosaur and has been really trying to take me on a date, etc. however, this other guy who i’ve had a thing with on and off for almost 2 years also asked me as well. but i don’t trust him due to some things he’s done recently and some girls hes been w , etc. and just to complicate things more there is another boy i’ve been hanging out w a lot who i was hoping would ask me. what should i do??