ty for sharing your story with us. If I may give my thoughts, I'd say it depends on your friendship. How much you know each other. If you know the person very well then it means what they are like when it comes to checking-in. If you are questioning yourself whether it is wrong or not to expect a response then this came off as if you are not very certain of your bond. Let me explain why. My besties for almost a decade and over 5 yrs, sometimes we do not speak for over months or not even see each other for a year or more. However, I know for certain they are well. If I checked-in with them, I do not have to worry whether it will take them sometime to respond. Unless, if it is an emergency. We know from both side when it is an emergency. This is because I know them very well, my bond with them is secure. This is a result of how I want my friendship to be. I understand some people need constant communication which is absolutely fine too. The bottomline is it depends on how you built your friendship.
To your second question, I'd say this depends on your personality. If you say it is difficult to find new social connection then it will be. What you say or believe; either way you are right. It is up to you. Finding new connections depends on few factors, are you looking for people to hang-out f2f or online connections will do? In addition, you attract like minded people. Therefore, if you are not actively going out there either online or offline, then finding new connections is next to nothing. Friendship is like finding a lover. You need to put yourself out there and what kind of friendship you are seeking. Why would people want your company? Perhaps start a hobby or something of interests. Only then you can find new connection by working on "YOU". ☺️
All best! ✌️🤗