Opinions cheating or not?

So back story. 2 months ago going through a rough patch in my relationship. And last month I came across left txt messages between my husband and one of his co workers. Bottom line he called her pretty, said she had a nice butt, and they were sending kissing emojis and hearts. To me that’s cheating and he had intentions and what not. He claimed he did nothing at wrong at first then later after realizing I was done with him he said he was wrong he shouldn’t of flirted and he had no intentions and that they did nothing. I even went to the extent to call the girl out and she denied she even knew him at first but in the end came out they did nothing so if she was lying to me about even knowing him. Do you think something happened??

After a month of begging for forgiveness and saying he would never do it again and that he would change I moved back in... so recently like the past few days. He been saying he was gonna get his friend (a guy) he’s friends with at work a birthday gift.. no biggie.. but later today while shopping he dropped me off to run an errand and came back to get me. Well he found me in the store and I noticed he had a card .. no big deal but then I realized he cashed out before me and already sealed it.. now is where I’m getting suspicious.. so I asked when this guys birthday was and he said today. So I went on his Facebook to his friends and looked at this guys profile.. the guys birthday isn’t for another month so I called him out on it and I immediately assumed he was getting it for this girl at work I had previously caught him talking to. He got really mad and tried saying idk why his friend would lie and was mad cause I was accusing him. So 2 hours after the fact of this happening all while during a huge fight he comes out saying yes he lied that really his friend was 20 and just wanted a bottle of alcohol... THEN still not believing him I hack into his Facebook to find him talking to a DIFFERENT girl he works with and that really the card and gift was for her. And they had been talking for like a week at least on Facebook. He deleting the messages. I called him out on all this and apparently I’m the crazy one. They are just friends and such. But why lie , why hide it, and the biggest thing is we have been together for 4 years and I NEVER have received a birthday card/ gift. Not even an anniversary or Christmas.. nothing. So why the hell is she so special. And then he later comes out to say he felt obligated because she is always so nice to him.

I really need opinions on this whole situation please!!