Hi guys, as per title said, what do everyone of you think? can male and female can actually be just friend?

Why am i asking this is, i have a gf who is a streamer, as you all know that streamer will have a lot boys as viewers and they'll try to tackle her, so recently i found out that she and a viewer has been very close in chatting privately via whatsapp, both of them have a very good click and connection, a lot of topic to talk, my gf even complain life shits to him, she has been chatting with the boy for like 2 months, eventually they meet up and she never inform me instead, she lied to me that she is going to have dinner after work with colleagues, and has met up twice, about 2 to 3 hours each time meet up.

btw, im in long distance relationship, we always VC do stuff and gaming, I still can feel that she still love me, every time we meet up sure 88 gao gao, she even bought a lot of couple shirts for us to wear whenever we go out, and planning to move and stay together with me.

And how i find out she go out with the guy is that i have access to her phone, but she do not know i saw the message yet, im now in dilemma, should i question her or not why she lied to me? maybe she just want to make more friend? but... male and female can really be just "pure friend"?? and why she lied to me?

Thanks everyone