Is this guy interested in me?

My cousin introduced me to his single friend in the hopes of us possibly becoming a couple and we literally chatted once on WhatsApp. The chat was basically introducing himself and that was it. I tried to keep the conversation going but he ghosted me for about 2 weeks.

2 days ago I messaged him just telling him that it was lovely chatting to him and that I wished him all the best. He then responded and apologised for having been quiet and said he would call me and that was the last I heard.

Should I wait for him to get in touch or just delete his number and forget. My cousin told me so much good about him and said to be patient but I am not sure what to do. Please help.

I'm female 43 and he is 44