Why did he suddenly become infriendly?

I'm a late-20s woman and I rent a house (HMO) from a couple aged 50-ish. Though the husband does everything to do with the house. Since I moved in, he has always been very friendly and chatty - think it's just his personality.
He seems slightly eccentric. For example, he'll often randomly be reminded of something, e.g. a scene from a book, and he'll go off on a tangent. As he's a nice man, I’ve asked him about these things, rather than 'shutting him down'.*
Roughly once a month/every six weeks he'll turn up at the house to fix something (it's a London property - things break a lot!). He's always very*chatty, asks lots of questions about what I'm doing, seems very interested..... We text back-and-forth occasionally, always house or rent related, but sometimes with a bit of small talk. For example, when I didn't get my graduate job, he sent a huge angry emoji.
He’ll say, «*I’m coming to mow the lawn so might see you if you’re in*», though he doesn’t have to tell me this (he can access garden from behind house).
When I first moved in, he told me that this bleach would burn through my dress...and he kept smiling...I asked, ‘is it really that strong?', he just carried on grinning said nothing.
Sometimes he stares at me quite intensely which I find a bit unusual but it’s probably just his eccentricity?
About a month ago, I bumped into him & his wife on our street; he smiled and asked where I was off to; I told him the library.....he asked me what for, and stared at my face really intensely for like 2 minutes, he acted very surprised/interested in what I was saying. His wife started stroking his shoulder/arm (possibly to get him to stop?), but he just carried on staring at me….
A few weeks later, he came to repair something in the kitchen which took a good few hours. I was in the next room, we talked most of that time, about all sorts. He talks as though he knows me a little, says things like, «*oh you’ll like/find interesting xyz*». As it was a cold day, he had this massive coat, and he pointed to me and said, «*oh it’s huge this - you could get five of you into this!*» .
He told me not to worry about finding*accommodation*next year, when I’ll be on a grad scheme - he promised to help me find somewhere, as he knows people, which I thought was kind. He said he wouldn't take my security deposit for breaking a vase, either - although it was a cheap Ilea thing!
However, when I saw him last week, he'd obviously, actively tried to avoid me.*He knew I was in the living room, but he walked past without coming in to speak like normal. It was doubly odd as days before he texted to say he’d be collecting a parcel (accidentally delivered here).
I texted him about this parcel, he replied and came back, but he seemed to want to leave. "Well, I must be getting on...we (him & his wife) already behind today with work....*» His wife was waiting outside in the car.
I found him avoiding me odd, and it made me worry whether he now, for some bizarre reason, doesn't like me, and will become a difficult landlord, eg looking for reasons to take part of my deposit (landlords can do that)? Thoughts?

its probs a convo him and his wife had abt u ngl xx