What do I do?

[XR6_661]

So,

Lately my girlfriend of two years has been acting strange, really strange. But mainly noticible this weekend.

SO I get home from fishing on saturday night and she says "oh, I'm going out with a friend tonight." Yeah yeah I'm fine with that, just be quiet when ya get home. SO I ask who she is going with and she stutters a bit and says 'Josh' I said whos he. she said an old friend, I trust her so I accept it, fine see ya later.

Anyway, she leaves at 9. I get this text from a mate at midnight saying, 'I just saw your gf with some guy alone driving' mmm getting a bit suss now. So I get my mate to suss things out, he followed them for a bit until the car went to a dark lookout on a range road, he just kept driving and texted me what he saw. Even more suss now. Anyway she gets home at 4 in the morning, jumps into bed.

I wake up in the morning and ask her what she got up to, she started getting all nervy, and said some crap like she went clubbing and stuff. SO I thought ok, I'll play along see what happens.

All day long sunday she is clutching her mobile, texting every 5 mins, talking on it. And really didnt want anything to do with me.

Monday morning comes, ok I thought I'll take a look at her phone...Where is it?? She took it into the shower with her!!!

So the whole week has been the same, really secretive...jumpy, etc.

And tonight about 20 mins ago, she says she is going out with 'Josh' again and she doesnt know when she'll be home...I texted n said 'where are you' and she texted back and said 'car park near the bike tracks at the uni'

I know for a fact cos I ride bikes that it's very dark there, etc etc

Anyway, I've never had to deal with something like this before and I'm at loss of what to do??? Do I go to where they are and do a bit of a stakeout?

I'm gonna be devostated if she is doing anything....but from what I can see is happening, it's doesn't seem good.

Advice anyone, please!