The weirdest dream ever?

Hi, would anyone be able to help me interpret a dream i had last night? So first of all I'm bleeding profusely and i feel myself dying, slipping away but all the time im thinking that i'll be saved. then the dream changes and there are gangsters everywhere, watching me, following me, threatening me. one of them, an older man seems to love me though, i feel like he probably wont let me be murdered like the others want. i write him a letter and tell him how much i love him. he doesnt seem or want to believe me though. Now all of those bits of the dream were just , well, weird but its this last bit that was really vivid and surreal and has stayed with me all day. I was walking at night with my boyfriend's sister, we were supposed to be going for a meal and out for drinks but i was distracted by the cathedral. i led her up a hill and through the gates into the churchyard and stading there by a tomb was Gabriel Byrne, he turned round as though he was expecting me and looked at me seriously. He walked by me and threw me a bunch of 3 small keys. He told me to enter the cathedral and he told me something else but i cant remember. I went to the doors and I seemed to know which key to put in the lock. The huge door unlocked and i went in. I wasnt sure what to do next when he appeared behind me again and tried to explain, he then change dhis mind and said to me 'I'll come with you and show you' . All 3 of us walked through the inner door and he took my hand. He turned to me and said something about things changing if we went in together...some kind of marriage...he said I would benefit but my bfs sister prob wouldnt...although i dont think benefit was the word he used. He led me up winding marble stairs to a very high point in the cathedral and when we reached the top, i turned and bfs sister was no longer there. he showed me amazing things....there was a book of every persons name in the world....there were photographs of everyone....he kept holding me tight....every new thing we saw, we embraced like it was somekind of joyous revelation....it was so real ...what could it mean?!