<human>: Summarize the given text in a few sentences.

I have an acquaintance that I have been trying to be friends with for a long time. 

Yesterday I worked open to close, so I was very tired and overwhelmed

He told me that today was the anniversary of his sons passing. 

I didn't know he had a son. 
Much less a deceased son.

I was caught off guard and didn't say much to him. 
I didn't want to be rude but I probably did brush it off.
 This was not confiding in me. This was just him happening to see me and answering my question.
 I was trying so hard to be respectful that I probably came off as passive. 

So, I want to buy him a gift card to this shop I know he frequents. 
I would like to give it as a "I hope your doing alright" present.
 Like I've said: we aren't really close friends. 
I would kind of like to give him my phone number along with it in case he ever wants to talk or we lose contact or something?
<bot>: I want to buy my acquaintance a gift as a sort of apology- sort of lets be friends deal.  Sorry about the formatting.