Please help

Ahh guys have u ever been in a situation in which one person mistakes u and another person which u even don't know about to be the same person I know it confusing but seriously try and u dear stand a guy on fanpop mistakes me and crystal Celeste to be the same person even if I don't know her why? I told him I'm not her but he doesn't understand what should I do plus he alisema he loves me even thought I don't know him very well so help what can I do?