I met my friend, M, through her current boyfriend, R. At that time we were all friends and occasionally my friend joked that she thought R had a bit of a thing for me. It meant nothing to me because I had no feelings for him and he never voiced them. Also, nice as he is, he is quite an odd guy. My friend M always joked she could never see him in a romantic way and I used to agree.
Anyway 3 years later he declared his undying love to M. At first she rejected him, saying 'come on, its R!'. But 3 months later had a change of heart and now they have been together for a year.
However whenever I stay overnight with her she'd make jokes that R had a thing for me, she said it about 3 times during one visit until I asked her to stop. It wasnt nice seeing this jealous side to her.
When lockdown started I heard from M every week, we'd have long phone calls. This went on until about a month ago. During the past month R and I have been in touch, as I wanted to send her something for her birthday and he helped me decide what to get etc. He also asked my advice on a couple of things, as friends do (just work stuff.
I have messaged her 3 times, including a birthday message which has been read with no reply. I now suspect she is treating me this way because of my communication with her boyfriend. I dont know for sure obviously. What can I do, if anything?