Why would he answer this way?

I had a date with a male friend and one of his female friends last week. Everything went well until she asked him what were we (me and him) and he started saying how he doesn't know how to label it and goes on about how of all the things in life he only struggles with this.

We then changed topic

Later i've been invited to a wedding in a foreign country (one that he wants to visit too). The invitation was open to possible boyfriends/girlfriends too. I told him that and he joked saying "you should consider me, tell em i'm you're boyfriend and it's all good" and i reacted with a "BOYFRIEND"?

He replied later with a "i bet you were scared for these 2 hours before i answered you", i jokingly said "who knows" and he replied with a smiling emoji with hearts.

I don't know what is happening, i'm pretty sure that if i ask him he's gonna tell we're just friends but all of this is confusing me

Why would he answer this way?
Post Opinion