So my boyfriend and his girl bestfriend always hang out and spend time with each other that I usually don’t care about cause I’m friends with her but recently they have been acting shady and she sent me a video of them laying in bed together and he had been ignoring me and blowing me off for the past week and they have been staying the might with each other but b4 me and him got together he told me they use to have a thing and I’m just scared they have something going on.. what should I do?