What are some signs he's seeing someone else?

Long story short, I've been with this man for a year. Have found out before that he was talking to other women, but I forgave him. Yet, my trust is broken. Lately he has stopped calling me pet names, we're spending less time together, he has stopped texting me goodnight and says hurtful things to make me jealous (even though he apologized for that). I've tried leaving him, but he comes back and doesn't seem like he wants to break up. He's been kinda busy and stressed with work, and that's his excuse. My gut feeling tells me that something feels off anyway.
What are some signs he's seeing someone else?
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