<human>: I have a thought in my head that something might be going on. My long term girlfriend is giving me thoughts of something may be happening that I should be concerned with. 

She and I don't live together, but she lives with her kid. Over the last month she has been less to communicate with me via text message. This doesn't concern me too much as the other things that may be going on. 

Recently the Iphone updated and when updating it requested a pin code. She has never pin coded her phone before. When I asked about it she mentioned that it requested it. I know from updating my Ipad that this is true.

Where it gets me is when we were at the phone store I saw her enter her pin number and it was different that her usually pin number. After a few days I asked her about it. She said that she uses different pin number. That didn't ease my mine as she has used the same pin number for everything I know her pin number to.

 She then said that she changes it every so often. This concerned me also as the update for the iphone wasn't very long ago.Now something else is that she has started wearing makeup again when she normally doesn't. She knows that I don't prefer her to wear it because she really doesn't need to. 

This isn't as much concern because she has done this in the past where she decides to start wearing it. When I asked her about it she got all defensive about wanting to wear it though.

As far as her past history, she did cheat before we met and actually cheated on her husband to be with me but that was many years ago and I haven't had a real reason to suspect something before. 

I told her before that if she wanted to be with someone else that she should let me know because I would rather know than find out later that something is going on. This was in part from her past history.

I want to ask her to just show me who she has been texting but I am sure she will most likely not and get upset that I asked. Can you give me your thoughts on the matter? What do you recommend that I do?

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<bot>: long term Gf acting strange, I suspect she may be doing things that are not appripriate for our relationship.