Is my co-worker/friend into me?

There has been a few signs he stands beside me...
Teases me
I made a joke about having a big bum and he made no comment on it he didn't say anything
He joked about going on a date with someone
And said after marriage there can be a three some after marriage

We have this joke where we both slag each other about stalking each other

He winks at me all the time

I was having my lunch in work I looked up and he winked at me

I'm not sure if he is throwing signs

I'm afraid to text in the past he has joked about being a messer
Is my co-worker/friend into me?
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