What would you think if your coworker did this?

I'm not working there anymore, but when I did one of my coworkers was always so sweet/kind to me... especially when it was a rough day. He always gave me compliments on my hair, and shoes and stuff. I remember once I was having a really bad day and I stayed at work longer than usual. He asked me in private if I was having problems at home. I laughed it off and said no but he stayed serious and said he's there if I wanted to talk. I ended up confiding in him and he gave me good, honest advice. Anyway long story short, I realized I never really told him thank you or how much his kindness really helped me while I was working there. He recently requested to follow me on social media and that's y I started thinking about him again. I wanted to just text him and tell him, " hey ___, I thought about you the other day & just wanted to say thank you for always being so nice when I was working with you. Hope you've been okay." What would you think if your former coworker sent that kind of text to you?

I'd think he/she was friendly and wanted to show me some appreciation.
I'd think he/she wanted to show appreciation and I'd also think they have some feelings for me.
I'd think he/she is being weird.
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What would you think if your coworker did this?
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