I think my husband is cheating..

My husband's birthday was 3/7. He turned 30. Every year for his birthday, I decorate the house the night before so he wakes up to it. This year I went all out with the decorations. I didn't do much gifts but I wanted the ones I did get to be heartfelt. I had our daughters fill out a book for him and I got him a book about how much I love him and I wrote in it. He doesn't really show much emotion but he cried when he read it. Anyways, we spent the day together and by the end of the night I was exhausted. Usually he falls asleep early and I stay up really late but this time I fell asleep by 10 p.m. I woke up around 1 a.m. and he wasn't in bed so I thought he fell asleep in the living room. I went out and he was awake, on his phone. I was half asleep and I just said "oh, you're awake" and went back to bed. Almost immediately he went into the restroom and stayed in there. When I woke up again about 2 hours later, he was in the LR on the floor saying he was going to sleep out there because he had to get up for work within 2 hours. I had a weird feeling but didn't think much of it. I woke up again as he was getting ready for work. He didn't really look or talk to me. When I asked what he did last night he said he didn't know. He kept saying he didn't know so I straight up asked if he cheated and he said "we're good, we're staying married forever" I let it go for the time being. When he got home, it was the same thing. Not denying it, just saying that we are good. By this time I had a disgusting feeling in my heart and stomach. He went to the restroom multiple times well being home which isnt strange but he wasnt actually using it. He'd go in for about 10 min, come back out for a few and go back in. I cried and asked him to tell me the truth. Again, he said we're good and then he went to bed. Normally if I cry, he holds me and comforts me but this time he was cold. He just went to bed. Now he is asleep in the room and I feel like I am going to throw up. My gut is saying something is wrong. I've never felt this before. I am nauseous and shaking and my heart is beating fast.