Not a love relationship.... but I miss my best friend ***sorry it’s really long***

I had been best friends with this guy for 10 years before he stopped talking to me 4 years ago when I was planning my wedding and found out I was pregnant with my son. I did not take it well he was the one and only friend I had left after getting back together (with my now husband). There at times when neither one of us were dating anyone we would hook up or talk about getting together but nothing serious ever came out of it.

My husband works at the airport as does old best friend so he would ask my husband about the kids/me whatever but never pick up the phone. I’d text him on his birthday and his mom her birthday. But other than that I had put him out of my mind as my “best friend”.

Sadly last night was his mom’s celebration of life (she passed away over the weekend) I was reluctant all day about going. I haven’t seen or spoken to him in 4 years, but I went and as soon as he saw me he broke down because he “didn’t think I would come”. We talked for a few minutes remembering funny stories about his mom and old times. Until he apparently went in for a longer hug than his fiancé was comfortable with. (I’ve never met her until then) He goes to introduce me and says “this is Brittany, my uh uh uh, her husband works at the airport with me.” With that comment I paid my respects to his mother said goodbye to him and his fiancé to which he hugged me and reminded me “ I love you sis” in my ear. And I walked out the door. As I was walking to my car his dad stops me outside ( he was standing feet away for the whole awkward conversation ), he wanted to make sure I was okay, with the passing and after everything inside. He reminded me that I mean more to his son than “ her husband works at the airport with me”. And asked me to please give his son a call in the next couple of weeks and try to fix whatever rift there is in our friendship “he really needs you right now”.

How can I fix something I don’t even know what happened to cause him to stop taking to me? How am I supposed to take the “her husband works with me at the airport” rather than who I really am/was to him? Is it worth my time and energy to even try?

I didn’t want this crazy horrible feeling I’ve had all day. My heart says I need to fix our friendship my brain says “leave sleeping dogs where they lie”. But how do you fix missing my wedding, the birth of both of my children and 4 years of birthdays,christmas’ and whatever holidays....how do you fix the sting of the abrupt loss of contact.... when that you know of you did nothing to cause these things to happen.