I have the same problem. Losing interest isn't necessarily it though, instead it just takes a lot out of me to talk to anyone. Imageboards are easier since you fools don't know me, but the weight of my identity is too heavy in other interpersonal interactions.
I once had an almost ideal set-up with a girl who would just message me huge chunks of text daily without a big concern over whether or not I replied. Since I like listening I enjoy just reading but…I ended up cutting her off since I realized I did kind of want her to care about me, too. Reconciling these two emotions, fatigue from being known and the desire to be loved, has been my mental health goal for several years since our friendship. I currently have a friend who is also a listener and his presence in my life has helped a lot. I'm now more regular with my other (best) friend than I have been in years.