What would you do in this situation?

My cousin and her new husband are staying with us and It is kinda awkward because my cuz's hubbie is new. And then I was taking a shower, and it was just me and him at my house and I'm just wearing a towel and I go into my room and he is sitting on my bed. I was just in a towel and I just stood the and he like stared at me for a second and then handed me my bra I left on the floor and went downstairs. I am really creeped out and we r going to be alone tonight again. He claims he doesn't drink so his wife and my parents r going out... I'm kinda scared, but my cousin really loves him and I donnwant to break them up and he didn't really do wrong, like he didn't touch me or anything...