I thought he was gay?

I have a friend and we’ve know each other for the longest time. I’ve been there for him when he was having a different relationship and a lot of other things. A while back we were having a regular conversation about our sexualities. He said he was gay and I said I was bisexual. Obviously that doesn’t change anything and it won’t. So we continued our friendship. Yet he’s been acting flirty recently. I brushed it off as a joke. However he was spamming my phone last night so I texted ”you were vibrating on my belly” because my phone was on my belly. then he replied with “maybe it would vibrate somewhere else ;)”. Now I’m starting to think it’s not joke. Maybe I’m overreacting I don't know. Thoughts? Advice?
I thought he was gay?
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