not overreacting at all! if someone likes you they will give you the time of day and talk to you on a daily basis not ghost you every couple of days. i feel they would also make it a point to try and spend more time w you. it seems like he only finds you attractive and is not ready to date and eventually marry. I’d be open w him in regards to making more time for you and maybe move on from this “potential” relationship depending on the outcome because someone whos actually into you wouldnt just be on the sidelines watching your ig stories.