Cat fishing fiancé caught.... is this cheating? 😩

So my fiancé left for training while I was in my last trimester of pregnancy. He came home for thanksgiving and I found dating apps he downloaded on his phone and then deleted before he came home. I found texts when I logged into the dating apps and he claimed it wasn’t him. The accounts were under a fake name so I just let it go. I was gullible. He claimed I was overreacting and emotional, which I was emotional being 6 months pregnant. He came back from training on Jan 31st and was there for our baby girls birth on Feb 2nd. I then found a fake Snapchat he had created while down at training. I made him log into it but by then all the messages were deleted and he unadded the girls he was talking to. Now, Snapchat just came out with a new update where you can “download your data”. Anyways I had the data sent to my email of when the account was created and who he deleted friends wise. He had over 50 girls who he deleted friend wise. Not necessarily talked to but had the intentions of talking to them. I asked him why he deleted them and what the convos were about. He said he asked the girls for nudes using the fake dating accounts while down at training. He told me he ended up receiving some. He said he did it with a group of guys for “fun” while they were drinking. He said he never sent anything in return and didn’t pay for any of the nudes. I’m not sure wether to believe him on that. He said he didn’t do anything in person with anyone either. I consider this cheating, he says he doesn’t because no one knew who he was. I can’t tell if I’m over reacting, is this cheating??? I’m really struggling trusting him right now and any thoughts are welcomed. Thanks 😩