My girlfriend knows my password to my phone

Dear Topbuzzer, I'm Ike, My girlfriend knows my password to my phone. She can take it anytime anyday to check whatever she want to know on the phone. But I don't know her password and anytime I try to pick her phone then she will quickly say... Ooh I want to do something with my phone I will give it to u back and she will never do as she says. So one-day I was able to capture her password and I went through her phone to check Wat at all she hiding from me.  But I find out that she chatn with a guy I hv won her about before. Wat she did is to change the guy's name from Francis to abeku. But after going through everything I can see she is cheating on me. So I therefore screen shot some of the chat as evidence.Now I don't want to do I really need ur advice on this pls.Dr. Mama Zimbi, I'm Ike, My girlfriend knows my password to my phone. She can take it anytime anyday to check whatever she want to know on the phone. But I don't know her password and anytime I try to pick her phone then she will quickly say... Ooh I want to do something with my phone I will give it to u back and she will never do as she says. So one-day I was able to capture her password and I went through her phone to check Wat at all she hiding from me.  But I find out that she chatn with a guy I hv won her about before. Wat she did is to change the guy's name from Francis to abeku. But after going through everything I can see she is cheating on me. So I therefore screen shot some of the chat as evidence.Now I don't want to do I really need ur advice on this pls.