Ugh! Wtf!

My boyfriend just lost his baby brother. And, they are going on a trip... His brothers girlfriend is going with them, and I would be okay with that if she hasn't been trying to throw herself at him. When his brother first passed she asked to stay with him. He told her no I'm not comfortable with that. Then she asked again. Again he told her no. Then she touched his butt!! And followed him around at zach funeral. I understand she's upset.. but now hses riding with hpmy man all the way to flordia in the same car... but I feel so anxious... I'm really worried since they are both in a sensitive spot right now.. I know for a fact my man loves me. And, I trust him. But something in the back of my mind just is nervous... And worried. He swears nothing will happen. Am I being stupid? Would you be freaking out too? Help! Am I being to controlling?! Idk what to think. Honest.