Would you get in a relationship 4 months after ending a previous one?

So I was dating this guy off and on (mostly off) for 4 years. Ultimately it didn't work as I didn't feel we had a best friends/deep connection, which is important to me. So I started talking to this guy I work with. It was strictly friends at first and I NEVER intended it to be more than that. But we totally vibe with each other and already am more comfortable and more connected to him than my ex. I always had a rule never to date someone I work with which is why I'm so hesitate to get into an actual relationship with him. We've gone on a date and seen each other outside of work but idk if he'll eventually ask me to be in a relationship with him. I want to but I feel I should wait since my break up was in January. I'm completely over my ex, I was done a while before the relationship ended. But I don't know if I should stay away from this guy cause we work together and it can get messy. I get that. Or if I should just let him know I don't want to define what we have as a relationship anytime soon