I think my Leo is in Hibernation

So this weekend I went to where I used to live and work. I stopped by and saw old co-workers. I didn't see my Leo. So after I left I thought the courtsey thing to do would be to let him know. So I texted him (it had been almost 4 weeks) and said "I stopped by the station but didn't see you" He responded quickly and said "Oh really? I am on my way into work. I start at 12" He said "the construction is a mess huh?" I responded "yes it should be nice when its all done".
Then Nothing... Silence.
So the next day... I texted him something funny. He responds again quickly with a one word answer. I texted "How are you doing?". He responds quick again "Good, just had a long lunch with my family" I texted him again and say "Maybe we can do lunch sometime soon. I miss my friend". He texts "Sounds Good 🙂"
I think I really need to leave him alone. I know he responded nice but I didn't get a warm and fuzzy from him.
My friends that work with him said they see him walking with his head down alot and shuffling his feet. Not sure to even go about this. Part of me wants to tell him how disappointed I am in him. We have been friends for over 18yrs. To just blow me off...or at least it seems that way.
I need the advice of all you wise Leo's.

Something is going on with him...When I have a lot of stress on me I tend to shut down and shut people out...trust me it's only temporary he will be back to himself in no time...maybe it's a nice gesture to reach out to him a little...I like when people have me in their thoughts.

I might just do that. I don't want to push him away. He is in no rush to see me, that doesn't make me happy. We have been friends/known each other for 18 yrs. I really am there for him.
I was just going to leave him be, but maybe before I do I could say this to him.?
"Not sure if you are going through something, but I am here if you want to talk"
Is that good?

Don't say that!

Just do the lunch. Don't overthink.

I didn't end up sending anything to him.
I couldn't make my mind up so I did nothing.
Does he know that I still here for him.?

I am not a Lion, and I am not a man, but I wonder if you know where he works and when he works...why don't you just take action? Be there when he gets out of his work with a piece of cheesecake and a huge smile! I'd prefer surprises like that than a lot of text messages.

I texted my Leo. He posted something on FB about building a firepit. So I texted him and told him it was nice and he did a good job. He responded pretty quickly.
On the advice of some of you Leo's, and with he and I being long time friends. I figured honest is better.
I asked him.
Me: Is it ok me texting you?
Leo: Sure
Me: I haven't really heard from you.
me: I felt like Might be bothering you.
Me: I am always your friend and am here for you if you want to chat.
Leo: Thank you🙂 You're not bothering me either.
Me: Haven't heard from you. Did you fly off the radar 😉
Leo: and likewise for you too.
me: Was just making sure all is ok.
Leo: Nah I'm just all over the place right now.
Me: That comedy special we watched was on the the other night.
Leo: Oh sweet !
Me: Ok. Thought I had the cooties and you were staying away.
Leo: I dont know. Do you? 🙂
me: I don't think so. Maybe Wookie Cooties. (We are both big star wars fans)
Leo: Wookie Cooties. I love it
Leo: That comedy special. I love it, still watch it.

then we went back and forth talking about geeky Star Wars stuff.
And he was super talkative.
I endeding the texting convo with Sleep well. Don't be a stranger.
Leo: You too, I won't 🙂

I hope I did good?
What do you Leo's think?
After I said all of that. I won't say anymore. I made my point of letting him know I am there.