My girlfriend talks about her ex's often (like what they do or how they acted together) and the other night while we were sleeping I was awakened by a text msg that came to her phone in the middle of the night from her ex asking if he could come over. The next day i did something I probably shouldn't have, and regret doing so as it is not who I am, but I looked in her phone and the messages were deleted. I have seen a few come from him and now they are not there. She has never had a lock on her phone but now has put one on there. Should I be concerned? I'm trying to let it go but it seems fishy. Looking for closure.