In a Relationship from last 2 years but still feel alone .

F27 , I am in a relationship from past 2 years with M33 (Divorced) . I am a kinda person who always into things which is important for my partner . I don’t like it , I”ll still be with him . Whatever is important for him it is important for me .
So I didn’t like going mall anytime in my entire life but I went with him like 7-8 times in these two years . Recently , I went to a mall and I saw husbands/boyfriends helping their wives/girlfriends choosing clothes and waiting for them outside of trial rooms to see how it looks . Then it clicked me so hard , like why am I alone here ? I was always there when he needed and now I am just watching everyone else and feeling bad for myself ?
I am with a guy who can be here with me , who is living just 8Kms away , it is Sunday we could have this moment but he is not .
And I can’t even say this thing to him . It’s tuesday today and still I am not able to come out of that situation and feeling pathetic for myself.

TL;DR : In a relationship still feel alone because my partner is no where around me despite living in the same city .