Basically I’m worried about a regular client of mine. He’s seen me almost a every month since I came to London two years ago a few times a week and we built up a friendship over time and I really like him. Not on a romantic level just as friends. I don’t even really think of him as a client and he said the same before to me that he think of us more as friends.

He does text me throughout the week just few naughty text exchanges and calls to see how I’m getting on.

A few weeks ago he was telling me he was sick. And that he had a really sharp pain in his throat. He also ironically enough was talking about death and that a guy in the gym he went to died suddenly while running on the threadmilly.

He hasn’t contacted me in weeks which is really unsual for him and I am a bit worried that he might of got very I’ll or something bad happened. I’d be so upset if he was seriously sick or even god forbid past away and I never knew.

I was think to reach out to him and ask him if he’s okay but I don’t know if it’s appropriate but I was worried a lot today and a bit upset that I haven’t heard from him in so long.

If I understand correct you've been meeting this guy for 2 years so feels to me like enough time to get to know him to have idea if it is appropriate to text him.
You were texting in between meeting already anyway.
He is not an idiot and he knows you worry now. So that he doesnt text speaks of himself.
So I am betting something outgrow his ego to text you.
 
Hopefully he gets back and better have legit excuse. Let us know later.