i am a friend of raymi’s, and she asked me to give you some help.
Since you have been with your GF for 3 years, she might be explorering
different options. The human mind is wired to cheat, we are ment to
spread our seed and to procreate. You should confront her on this,
just ask her. Dont be accusing, but most of the time a man gut
instinct is ussually right, and of course if you should have the same
rights as her. You deserve to know the truth, and deserve to be
sleeping around if she is too. I am sorry that a 3 year relationship
has turned to this, honesty is the key to every relationship. Sit her
down and talk to her about this immediatly, cause is she is sleeping
around, she could be spreading diseases to you also.