<human>: Summarize the given text in a few sentences.

So I don't know what to do and havn't asked her about it yet. Maybe no actual cheating with her ex [28m], who is also a mate of mine :/, or maybe it's still happening now.
She had texts on her phone from him dating back to when we started. Felt shit reading her phone but worse now.
Feeling like I don't trust her or even know her anymore and that if I brought this to light and asked for answers that she'd lie to not have to deal with it.
Sex is usually only when she wants and maybe once a week at best. She says she'd be more into our reltaionship (more inimate) if I hurried up and married her. So theres pressure from her to marry that i dont quite understand.
On the surface it's a good relationship and I love her. Ive asked her Dad for her hand and even told my family I was proposing soon. Shes actually a really great person and this may all be because she wasnt certain about us just at the beginning.

Think I need to deal with this first tho. Any guidance would be great I can't talk to anyone about it cos all our friends are linked and duno who I can trust to give me answers/not spill the beans.
<bot>: about to propose and find txt evidence of cheating or at least intention to cheat but from the start of our relationship.