I'm friends with a woman that I met when out now yr2 dc started reception together. I think initially we gelled because we are both quite quiet introvert types as are our dc's. It took a while for her to seem quite 'open' in our friendship iykwim whereas I'm naturally quite an open person despite being quiet etc. I know she is a very private person. Her dh works long hours and she has no family locally (like me). I regularly have her and her dc round for coffee/staying for tea etc yet have only been invited to her house around 4 or 5 times in the 3 years I've known her (perfectly nice, tidy house so she's not embarassed by it or anything). When it was her birthday, I got her a bottle of wine, took her out to lunch etc but when it was mine I didn't even get a card, although she claimed she'd got one and kept forgetting to drop it off.
I can't quite fathom out why she seems so reluctant to reciprocate invites. I KNOW you shouldn't invite just to get reciprocal invites and I genuinely don't but I would consider her a good friend and would have expected a few more invites by now. We do get on very well. I go through phases of being peed off with this business and then swing to trying to rise above it. As far as I can tell she doesn't seem to have many other friends so it's not as though I am just down at the bottom of a long list of friends and she just doesnt have time to fit me in etc. I can only conclude she either just doesn't see our friendship the same way as I do or she has some kind of issue with having people at her house. I'm not the type to just blatantly ask why I/we don't get invited to her house. God it all looks a bit petty on my part but I can't help being bothered and a bit hurt by it!