I can relate. Sorry if this seems long.
Growing up I also felt unloved by my mother.. She used to say unkind things to me. I felt unwanted.at times. She would only say these unkind things to me when no one else was around and when she saw me in tears she'd then say she was joking,but then say unkind things again on another occasion.
I mentioned this to my own grown up daughter the other day. She was the first person I ever said this to. Now I'm telling you on here. My daughter was really shocked. I buried these memories until recently.
For most of my childhood I don't recall being shown any form of affection lby my mother like I show with my own children. (hugs, kisses etc). As an adult it was always me who initiated displays of affection with my mother by giving her a kiss on the cheek.
I have only heard her tell me she loves me once, and this was only a year ago, after I told her I loved her and I'm in my 50s now.
My dad however, showed me lots of love when I was growing up. I remember him always holding my hand if we went out, or wanting to take me with him if he was going out to the shops or somewhere else for the day. I cannot recall a time when my mother ever held my hand or even hugged me.I say to myself maybe she did but I was too young to remember. I don't ever remember even sitting on her lap, but I can remember sitting with my dad lots of times.
My dad made me feel very safe and would cook me food, buy me treats and just show 'care' in general, and always seemed to be emotionally available as well. He was a good dad.
As I got older I thought maybe the way my mother was brought up didnt involve alot of love, or maybe it was that back in her day parents were not as expressive with affection as they are now but she always spoke well of her own parents, so I accepted she probably loves me but can't show it
Recently I found out she'd been gossiping about me to other family members, and this took me right back to my childhood and made me question her love for me all over again, and I wondered whether she'd also gossiped about anything I'd shared with her over the years when I looked to her for 'support' as a mum (because other family members seemed to know my personal business, and this came out during a disagreement and was used against me) So everything I'd buried as a child came back.
I was very angry..It broke my trust. I couldn't even bear to see her for a long while. Out of respect for the fact that she's my mother, I have kept a relationship with her, although I see her much less frequently now. It's definitely not the same and I would never share anything with her ever again.
In my case if I were to put my finger on it, as a child growing up I sensed that her behaviour towards me related to the way my father treated me. and I think she was jealous of the relationship I had with my dad but I really don't know why.
They divorced when I was in my teens but growing up I remember it being said by one of my siblings that I was my dad's 'favourite'. I was too young at the time to know what that meant. I also sensed from my mother that she didn't want me to have a close relationship with my dad. I don't understand why. As a teen, I could definitely pick up a 'negative vibe' about me wanting to think well of my dad particularly when they were separating.
You mentioned that you care for your dad, so I wonder if your mums jealousy of you is in some way related to your dad, or maybe she could be just jealous of you in general who knows.