Me & my boyfriend been on & off for a year. His sister text me the other day & said he had another girl in his room. When I called his phone a girl answered & said "stop calling my man phone" 😕 so I went to his house & he wouldn't open the door. This morning he texted me & said "the whole this was a joke & that he was sitting next to his sister when she sent the text" idk what to believe or what to do! Any advice?