Nicotine withdrawal?

My bf quit vaping about a month ago. he still has nicotine lozenges but it’s gotten much less. im so proud! however, two weeks ago he randomly, & very shockingly broke up with me. we were a great couple. everyone around me was shocked. I was heartbroken and couldn’t process what the hell even happened. he said some hurtful things and was acting like a completely different person. I couldn’t recognize him. he cried really hard when he did it and seemed so lost and empty inside. when it was all said and done, he contacted me almost immediately telling me he missed me and regrets it. since then, we’ve hung out slowly and things have been much better. he’s been really trying. we just came back from a nice weekend together like we always had. now that im thinking about it, could this have been nicotine withdrawals that made him so anxious and different??