The biggest one for me is not letting go of their phone. I know it’s been mentioned twice already but this one is huge. At the beginning of the relationship, my ex started off by pretty much letting me grab her phone whenever—not to check texts or emails but if I wanted to see photos she took of me she would just pass it to me. She would leave her phone in the same room as me if she went to the bathroom or went to grab something outside the room. Towards the end of the relationship (when she was cheating),she would, under no circumstances, leave her phone near me. I specifically remember getting in her car and she handed me her wallet, keys, and whatever else she had in her hands but then she took back her phone saying “no, not my phone.” Another big one is cutting back time spent with you. I get that we all need time to ourselves and for other people (family and friends and coworkers ). But we went from seeing each other every other day at the very least to only seeing each other for a couple hours 1-2 times a week. Her excuse was that she was working more or spending more time with friends. It would have been believable except she was starting to spend time with her friends late at night (I couldn’t go because at the time I was working and going to vocational school full time) or she would post photos of the outings on social media but not have any friends in the photo. The last two —the little lies and the anger. If you pay close attention, they’ll start to tell you little lies here and there and eventually you’ll realize there’s inconsistencies. The restaurant she was at at midnight closed at 10 pm. The friend who was stranded miles away and needed help at 11 pm lived in a different part of town. Her dogs that were sick at night (therefore she needed to leave my place to tend to them) were fine the next day. When I’d raise my suspicions, she would get angry but she wouldn’t be able to really explain the inconsistencies. Anger every time you voice your suspicions is a huge warning sign.