I have know sally (fake name) since I started my nurse training over 15 years ago got very close spent a lot of time together during the duration of our 3 year course. The final year she had to defer for a year due to a hospital admission in which I supported her and visited her when I could. We both eventually finished our training and got jobs in different hospitals. I met my bf and later bought a house together and had our son (who is now 8). We eventually stopped seeing each other as much due to working opposite shifts but always felt I made an effort visiting her etc, sending her a postcard if I was on holiday. She came to my sons christening and was his godmother, after a few years I felt like she started to ‘back off’ I asked was she okay and she said all was fine. Her 30th bday came around and I made an effort took flowers, fancy bottle of champagne etc (she didn’t have a party due to being in Covid times). Recently my 40th rolled around in December just gone and heard nothing from her?! No card, text nothing…. She messaged me asking what I was doing over Xmas I replied saying I’d been London for my 40th… no belated birthday nothing…. Thinking what’s the point in carrying on with this friendship when it all seems one sided, advise