relationships.

My partner told me he likes pregnant woman so he thought it was attractive now that we have 8 weeks leff he doesnt seem close to me anymore, ignores my texts when he is out, ignores me at home and doesnt act like he did 2 months ago, i have the feeling of him breaking up with me he hides his phone everytime i walk near him hes always on fb when he NEVER used it before he seems to secretive now, like hes trying to hide something when i confront him he gets nervous and trys to change the subject what should i do?