I'm so sorry for what you and your boyfriend and his family are going through. I think the best way to let him know you are there without actually being there is just to let him talk. No matter how graphic, crazy, or weird just let him talk and get whatever he's thinking off his chest. I know after my sister died I had some horrible grim thoughts and my boyfriend at the time (6 years together) was not here for the funeral. He wasn't much help in the emotional help either. I felt like he didn't understand and wouldn't know what to say so I didn't go to him after the first time I did and basically got nothing.
I've always been told death especially of someone who's close to you can either tear a couple apart or bring them closer together. It just depends on how you show your support and love. I remember people asking me "how are you?"...me being me just said "I'm ok"...when I really wasn't.
Send a card or a flower/plant to the funeral? While working at the flower place I worked I noticed a lot of people sending gifts because they couldn't be there. It was a way of acknowledging what was happening. Cards are nice though...we still have EVERY single card that was given/sent through the mail. Flowers die but it's a nice gesture. The only plant or flower I remember getting was actually not even here for me to see. It was a tree in memory of my sister in the Caledonian Forest actually sent to my family by a fellow uk-yankee member.
Don't say he's in a better place...most people don't think so. A better place is being with the family and people that love that person.
The best is just letting him talk...really it's the best thing. Even if he just wants to call you and not even talk just sit there...then let him.
Good luck with everything and I'm really sorry your school won't let you go. Can I ask how come?? Most of the time they just ask for proof...when my great grandmother died they needed just the clipping from the newspaper regarding her death. Well...the teacher did.
but I think she was more nosey then anything.