Feelings?

My boyfriend has changed so much over the last couple of months and I think I don’t like who he is anymore. He’s took up smoking, weed, drinking all the time. He’s starting to dress/talk/and act like a jakeball. He kept all the smoking from me until we broke up and he he told me everything so I’d not leave. I’ve been spending quarantine with him at his house and it’s just making me realise how different he is from the start of the year.