I need advice..

I was dating a guy for two years and then we decided to go on a break because I had been making bad choices and we weren't working out. during our break I took time to grow and I became really happy with who I am as a person. I made lots of new friends and I took a vacation out of state to meet a guy that I met online. it was the best trip of my life and we ended up falling pretty hard for each other. me and my ex recently got back together but I noticed that he didn't work on himself at all. He's still the same guy who never talks to me and only cares about work. his negativity is really bringing me down and I can't get my mind off this online guy. we have way more in common than me and my ex. I really want to end things with him so I can move on and be with this new guy who makes me happier. But he's desperately in love with me still and although it hurts to say it, I'm just not in love with him anymore. am I a bad person for wanting to break up again?