<human>: Can you provide a brief rundown of the text in within 3 sentences?

Hello everyone, first time poster.

Me & my GF have been together for about 2 years & 8 months. I work at a family restaurant, she works as a health consultant. Yesterday, one of her business partner whom is also a friend she knew back from 2003 passed away - due to heart attack. 

Unknowing, last night we had an argument, because being the jealous being I am (sorry), I kind of take it to heart when she wouldn't come see me, but wouldn't have a problem driving for her business purposes (and to see this business partner).

I am not blaming her, but in the heat of argument I guess ego took place. She ended up coming anyway, but I was out to cool my head off. I didn't expect her to come, and I felt really bad afterwards. So she went back, and I drove to her place instead. 

Bit too late when I got there as I assume she already went to bed (doesn't pick up call / reply text). So I just texted her to apologize, and went back home and call it a day.

Today, I woke up to a text from her saying her business partner/friend passed, and i honestly dont know what to think/say/feel. I called her, tried comforting her but I guess she is overwhelmed by the incident, and still mad at me for last night.

I feel so guilty, I know the death has nothing to do with me, but I did started petty arguments since she was always spending time with him (business purposes). I have noone to talk to, and I don't know what to do. Help, please.
<bot>: GF's friend/business partner died yesterday, we argued unknowingly and now I feel guilty and don't know how to handle this.