From the way you write, I presume that you must be very
young.
You must know that not all girls who are wearing sexy, are looking
for sex. They just want to look good on themselves. And you
definitely should not have the idea that you must have sex with all
the pretty and sexy girls who come to you. You must know how to
reject and do things consciously.
You have a girlfriend who treat you well but yet, you ask another
girl to come to your place to talk cock with you. It's not purely
because of the girl is your gf's friend. But even if it's just a
normal friend, I think you shouldn't even invite her.
Subsconciously, you are inviting her for sex and I know your are
pretty sure about it youself. You just want to see how far you can
proceed with her. I mean this is definitely wrong and immoral.
Think about it.
I feel that you should let your girlfriend know about it and admit
on your mistake. If you are a man, you should admit to whatever
things that you did wrong and apologise to her. She has the right
to know even if it means that she will break up with you. Please be
fair to her. Anyway, it's your fault also to invite trouble. If you
really love her, then you should let her know the truth. Unless you
do not love her and think only for yourself and your own desire. I
know that she will definitely be sad when she know the truth but
you should not hide from her.
Please be fair to her. Please!!!