I really need help, confused

You heard the saying "Never leave the one you love for the one you like"? Because the one you like might leave you for the one they love. But it's kinda different in your case. Everyone likes each other when they first meet. But then you get use to each other and maybe find things you didn't like about the other person you didn't know about. I find it better to get to know a person very well before you give it a title if I really want a successful relationship. This could just be lust and physical attaction. Be sure of what you want out of a relationship before you get in one. Think of qualities and interests and everything else that matters to you.

This could be an illusion that you feel something for your bf's friend, but you wouldn't know until you decide on something. You have two choices where at one, you are taking the friend's word and feelings about you and decide to go with him and potentially looking for a break up with your boyfriend and him with his gf. There is also a potential that your boyfriend and his friend won't be friends anymore. There is also a chance that the friend's feelings are temporary, more like lust or infatuation than anything else and when you are together even for once, it will go away after and he will go back to his girlfiend and you will try to go back to your bf. And you wouldn't know if he'd take you back or she'd take him back. There is also the potential of him really having feelings for you and vice versa. If that's the case, then you will be happy and enjoy your new relation but think about the consequences before you act on it.
Aside from the friend, if you really don't love your boyfriend anymore, there is no point of dating him anymore either. Just let him go so he can find someone that loves him as much as he loves you and you can find someone else.

It's better to spend your time in life with the one who loves you and whom you love. Stick to your bf, see his virtues and value his emotions You'll overcome this illusion.