is he cheating?

hello ladies, so Im head over heels in love with my fianceand I don't want to loose him. I keep going through his stuff there's nothing to be found. he has never cheated on me and i shouldnt think he is, but my pass relationships always ended because he cheated. but when I call him he doesn't answer most the time and when he does and we finish the convocation I say I love you and all I get is yea ok or whatever. I ask him why he doesn't tell me he loves me anymore and he says that he Disney have to say it all the time, but he dosent say it anymore. all he says is that he doesn't have to say it because he shows it. I told him that I want to hear it every now and then but yet still nothing. when we get in a fight he leaves and I try to call him to apologize but he doesn't answer. then I start to get images 8n my head and thinking he's cheating all over again.... he says he's tired of my going through his phone every day and he's tired of me acussing him of cheating. "All I do is go to work and come home." this is what he says all the time. then sometimes I simply ask how his day was or what he did all day and he says it's none of my business. then I start thinking all over again and imaging him with another female. is he cheating on me or am I just over thinking?