My girlfriend has lied in the past, thankfully they are never too serious, usually about something she did that she is afraid to tell me because I will be upset (like she tried shrooms once and didn’t tell me for several months and I had to keep asking if she had any secrets from me still and she kept saying no until months later when she told me this) but a lie is still a lie to me  and when she tells me I’m more mad that she hid it from me then telling me and because of it I have trust issues with her. Now I feel that even though I ask her if she is hiding things from me and she says no, she has said and done that before so it’s hard o trust her. On top of that she is never willing to let me see her phone, she says it’s toxic and not a good way to be together but I always say she can do whatever she wants on my phone. I’m not sure if it truly is bad by me and toxic to see what’s on her phone or if it’s on her, any advice would be appreciated. 