Oh dear......Please help my desperation?

My dear boyfriend Charles, Told me that he may have to explore The general fields for a Business trip. He told me not to worry but i am. We have been in a relation ship for I don't seem to remember about......Umm oh dear.....Umm hmm 3 years. And if he goes I me myself and I will miss his Company and appearance. I just need him to be here with me so i asked if i may join him in his exploration past the general field but he disapproved my request and i will miss him so much......Now i am frightened he will find another woman and betray me......Us.... What shall i do