<human>: Can you succinctly summarize the text in 1-3 sentences?

So recently my gf befriended some neighbors of her (3 guys) and they have gone out to drink and she's invited them over to drink at her place through all hours of the night.

Normally I wouldn't mind this kind of stuff but it's the fact that I've never seen these guys. They also seem to text her quite a bit and although I don't see any flirting going on, I notice that she's always ignoring them when she's with me but talking with them quite a bit when I'm not around. Also... the fact that I have yet to meet any of her neighbors (its been 2 weeks) that she's constantly hanging out with bugs me a lot.

Also, another thing that bothers me is that she neglects to tell me that they are around. Like the other night she was supposedly drinking with her roommate. I wake up to find out that she was with her roommate and the 3 other guys till like 4am. The fact that she keeps this from me while they are hanging out is extremely bothersome to me. 

When I bring it up to her she apologizes and tells me that nothing happened and that they know she has a Bf and that they don't like her like that. If I go any further into discussing about the topic she gets angry and tells me she doesnt want to talk about it. 

My friends are telling me to just do the same thing to her. I have female friends that she's never met before that I can easily go out with but that seems a bit petty but I don't think she understand just why I'm upset with her...
<bot>: GF hangs out with her guy friends that i've never been introduced to and she also neglects to tell me she's with them until after the fact. should i be suspicious or am i being too overbearing?