Similar to many of the above :
Super secretive with phone. Put a pass code on it which he had never done before and refused to give me the code. Than it itself was telling. Slept with it under his pillow or put it under the bed in his side. Or even on the floor next to the bed with a pillow in top of it. Very odd when previously it had no pass code and he just to used to leave it laying around.
Her perfume on him when he got home. She wears one of these horrible actor type perfumes all the time, even now I get a bit weird if I smell someone else wearing it if they pass me. He claimed it was not her perfume and the reason he smelled of something was that the cleaner sprays air fresher as everyone leaves the office, so it must be that. 🤔
Just being really nasty to me all the time. Going off it for the most random small things.
Booking work trips away in which she also had to attend for some strange reason. They worked together but she was in an entry position, but suddenly she had to accompany him on conferences etc.
You just know OP. They change, quite a few times I said to him who the hell are you as I don't even know who you have become now. He still denied it though. I found actual proof of various means (emails and hotel invoices) yet he still denied it.
They have an excuse for everything. Some of them are the most ridiculous things you have ever heard.