My male colleague offered me his arm to hold while we were at the boat party and we were in the crowd. What does it mean?

We are also close other than our other colleagues. Whenever we are together, we just clicked and skinships happened automatically. He always try to sit beside me or give me a space beside him when we hang out. But we are always bickering to each other like we gave each other mean nicknames and always fighting. But we have some unspoken chemistry.

My male colleague offered me his arm to hold while we were at the boat party and we were in the crowd. What does it mean?
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