Of course there’s no reason why not. People can fall in love with the same person more than once. Sometimes you see people going back to their Ex. People grow and change, sometimes for the better. The newness of the whole thing could easily bring up unwanted rough edges in relationships. people get to “grow” up over time and overcome some of these. It is not always the case, sometimes the reasons for wanting to come back may not be genuine. Just follow your heart, wherever it leads you.