I'm pondering that question for myself at the moment. I work from home, so my only daily social contact with is Hubby. Family are overseas. I have participated in a couple of community groups and done my time in one voluntary position or another, so I don't keep myself hidden away.
I ''had'' a friend who also works from home, and we made a commitment to go out to lunch together monthly. Went well for a couple of lunches, and then one day she seemed rather negative but I put that down to having family worries.
At our last lunch, anything I said was met with criticism up to the point of being ridiculed, and it didn't matter what topic we discussed.
We have had the odd messenger communication since and it has been no better. Also well overdue for our monthly luncheon date*. The last time two times I have initiated a message, I can see my message has been read but get no response, and its been along the lines of ''would you like...'' type messages.
I don't know what I have done either but I feel deflated too. I'm not sure if its covid related pressure we are all under or if it's a normal turn in relationships for her. I can see she is interacting with others.
Sorry, this is probably of no help other than to say please do not feel you are on your own with feeling this. It doesn't make any sense to me either...
*not in the UK so lock down doesn't apply.