Best friend and boyfriend

Brittany
Okay so yesterday was my boyfriend's birthday and he goes to college out of state, (only and hour and a half away) I wanted to surprise him, so I went to his college and spent time with him for his birthday. The issue is I asked my best friend to go with me because I have never really drove that far before and for safety reasons. She went with me and they met, but while I was down there my phone lost connection so I had to communicate with him through her phone, and they have each others number because of that. My best friend and boyfriend are both very charismatic people and they got along great and pretty quickly. Side note: my best friend also has a boyfriend that lives in another state, but she kind of likes (lightly) flirting with other guys when she's out. Question existing, I know it's probably a good thing that my best friend and boyfriend gets along, but should it be something I need to look out for in the future?