Is ue cheating?

okay so my boyfriend works a lot. He has two jobs as well as goes to school about every Tuesdays to try and get his GED. Well him and I talk a good bit. We're usually both busy during the day so we usually call eachother after work and stuff. Well he hasn't called me and I've called him he hasn't answered. I didn't think of it bc I get that he needs space Well that was four days ago. I finally called him and asked him what was up and I asked why he wasn't talking to me. He said that he wants to drop it and we can talk tomorrow. I found this werid so I just stright up asked him if he was cheating on me and his response was "why would I cheat on you" so I don't know what to think or feel please help

Is ue cheating?
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