What choice should I make?

I'm in a committed 10 year relationship. Both of us have opposite sex friends, and are very trustworthy. My boyfriend is going to New York to see friends, and staying upstairs at his female friend's house. They have been platonic friends since grade school. His other 3 NY friends don't have any room for him. I can't get vacation from my job to go with him. I can't deal with this situation. If I stay with him, I don't see how I can be the same person since all I feel is anger. He could choose to stay in a hotel, but wants to save the money. He isn't giving credence to my feelings, and saying I have a trust issue. I'm wanting to leave him. What would you do or offer in the way of help?

Has he given you a reason to doubt him in the past? Has there been infidelity on either part in the relationship?