Trust issue after living together for 1.5 years , is it normal?

Anonymous
Hey Girls !

I've been in a live-in-relationship since 1.5 years with my girlfriend. We just got engaged 3 months back. She always had trust issues because of her past relationships but i thought that it would get resolved eventually with time as our relationship evolves.

I've been always transparent with her to that extent that she knows my phone password and can look into whatever she want's to.
There has been 2 incident because of which i'm not sure now that i should marry her or not.

Incident 1 :
She found message of my friend where we've decided to go for a trip together. She got fumed over it because it was the same city where she wanted to go with me "first". So she was so upset that i decided to go there with my friend first. That guy is my best friend and we've been travelling together since past 4 years together.
Incident 2 :
Recently one of my friend was travelling to my city and he wanted a place to stay for a day as his flight was late. I live in a society where on every guest entry each flat owner get's notification whether to allow guest or not. I've previously talked with my girlfriend regarding this that my friend would be coming over as you are not here and she was okay with it.
He came late in night around 1:30ish we chatted till 4 in the morning as we met almost after 3 years and we started our career together in same company. Later before going to bed he told me that his girlfriend would come over to change as she want to attend some conference nearby and her sister also might join in. I told him that's okay because there were going to stay there till lunch time and i've got big place. When she arrived as i told security ask approval to let them him. I gave approval and i instantly got text from my girlfriend that who is she? And why have you approved? I told her that he's my friends girlfriend and would be staying here till lunch time and my friend was also there. More in comments...
Updates
8 mo
Just to clarify i was not alone with her. But still she refused to accept that and we had a big fight on it.
Updates
8 mo
I ask here to talk with my friend / her girlfriend / even her sister and to show cctv cam of society as well but she refused to accept that i'm clean.
Trust issue after living together for 1.5 years , is it normal?
4 Opinion