is he cheating or am overthinking

well so am 39 weeks pregnant today with my second. I have been having a feeling that my husband is cheating on me. it first started when he was posted near where I work so we leaved together unlike before where we lived in different countries. their is this time that he left his phone to our baby girl and for the first time I went through it. ( I normally don't touch his phone or go through his messages only when he shows me something) I noticed him flirting and sexting with two ladies. I was in denial for the whole month so I didn't ask. I have been noticing that he's acting wierd. he doesn't touch me or even cuddle, when we have sex it's because am the one who has 'forced' him. I tried asking him and he was like you are not forcing things am just fine. so yesterday I went for house warming to my brother's and spent the night there when i came back I noticed he didn't sleep home and something was ontop of the cabinet which I didn't see and when he reached the bedroom he grabbed and hid it very first. I didn't ask when I was putting his dirty clothes from yesterday into laundry basket I noticed a packet of condom and matchbox. I just know something is going on but I don't have any evidence and I don't know what to do. am clearly loosing my mind and I know that when I ask I won't be calm anymore. what do I do