Foa, chiharu's behaviour is really realistic. Imagine waking up after 7 years and seeing all the things that you had sth to do with in the past have changed so much and the only thing that you cared and thought would stay by your side forever and remain the same which is Ito, also changed. I mean I would be scared too. The guy is just scared and confused, he needs some time to sort out his real feelings for her so let him breathe, yeah? smh
Edit: I'm on the latest chapter and boy I am so happy to see Chiharu finally admitting his feelings. It took him some time but I can fully understand why. FIGHTING MY BOI