Don't dive in head first if you are not ready to do so. Explain to this new boyfriend that at this moment in time you are a bit confused. You are coming off a break up. One that you are not over yet. It can take time. If the break up was bad on you, it will be hard to go straight into another relationship and fully trust that person straight away. You will still be thinking of the last relationship. Only you know if you are fully ready for it. But also don't go backwards. If the last boyfriend dumped you or you dumped him, I assume it was done for a reason. You can spend ages wanting that same person back. But that person might not feel the same way about you. So play that side of things in a careful way. Seems like you are stuck in the middle of the past and the present. You might have to sort the past out first in order to move forward.