Friend asked me to prom as only friends but I have a bf

So I’ve been dating this guy for 5 months now and he’s amazing truly but I have a guy friend who used to have a crush on me more than a year ago who hasn’t been able to find a date for his senior prom. We aren’t close friends but I know that if I was to go with him I would refute any advances. As precaution I would only go with a girl friend of mine since this is at a different school than my own. I feel bad because his prom is this weekend and I know he wouldn’t ask me unless he was desperate and really needed my help. I want to ask my boyfriend but I don’t want him to get the wrong ideas. What should I do? Should I just forget it and not go?🙃🙃🙃