Student Exchange Programs

Okk so we’re both 21, but we go to different schools. Well recently my boyfriend became friends with this foreign exchange student girl and they share the same classes. My friend, who goes to the same school as my boyfriend, told me they are always with each other!! She said she saw them in the library and they were giggling about something. I asked him if there’s anything going on between them and he said “na we’re just good friends, plus I’m one of the only people who talks to her”. I can’t look at her facebook because she doesn’t have one!! He told me that tomorrow they are going to study, but I was thinking who really studies on Friday!? I really don’t feel comfortable with him being friends with her! Should I ask him to end the friendship?? I’m confused :[ I’ve been up all night thinking about!!