<human>: Idk where to start. We are going to talk tonight, but she has no idea that I know. I hate to say it but I had a strong hunch and I snooped.

 I logged into her Facebook this morning (guessed her password). I found that my girlfriend, let's call her liz, liz had sent multiple messages to my cousin Mike. Like semi nudes of her in the tanning bed, she covered her lady parts but barely if you know what I mean. Liz also had suggested that she go over to Mikes at night. That does he feel guilt about this. I mean some messages are friendly, others suggest she wants to sleep with him. He has turned down from what I can see all of her advances, saying he's busy but it's not like a no stop this, it's a not now it's a bad time. He hasn't said anything to me, we are not the closest of cousins but we have known each other since we were younger. 

This has been going on since June 10th at least all I could tell from the messages sent. I always felt something has been up, since the start of June, liz had not been acting normal, more distant, and less focused on me. 

Idk what to say tonight or what to even do from here.  I've been sick to my stomach all day, but I have work. Liz has texted me once today like a normal day like nothing has happened. I can't get myself to respond.

I hate to say I snooped. Just FYI I know that our intimate time has not been as great as liz probably wants, we do try but it's just not the same. So it kinda explains the reason behind her attempts but does no way justify them. She swears she loves me and "would not do anything to hurt me" 

Sorry about the blocks of text. It's very stream of conscious. I can't seem to think straight.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: went snooping and found my girlfriend trying to sleep with my cousin. She doesn't know I know. What do.