Needing advice

So my bf and I both work for same company (oilfield company) He let me know that we hired a new saleswoman and she asked him if he can show her new locations out in field. Meaning ride around with him. He says he will be on headset with me while on the phone. But they will be in same vehicle half the day. I’ve let him know how I feel but I feel he is too nice and is going to happen whether whatever I say. I’m not sure what too feel or even be mad. Someone please advise me. I don’t even know why I feel angry.