Search Results: moving in together

Ok I never expected to have to post here but here I am.
So My girlfriend is Japanese and we've been dating for a while and I met her parents like a month ago, they said they wanted a strong and mature man for their only daughter and I promised them I was strong enough to protect and take care of her.

Now I feel like they keep testing me though whenever we visit them/they visit us.

First incident her father kinda backhanded me in the face (not that hard but it kinda hurt) and he said it was accidental cuz he was moving his hands around and I was behind him. I barely reacted as I wanted to seem strong

Second incident was at their house, her mom asked me if I wanted anything to drink, I said juice or water if anything. Was sitting on the couch on my phone and 15 minutes later she threw one of those small juice boxes at me and it hit me right in the nuts. Again she said it was accidental and laughed a bit, I was really in pain this time for a good 15 minutes but I barely moved and acted like nothing but I think her mother could feel she had got me good. She asked if I wanted an icepack, I said no its barely anything.

3rd incident I was helping them with some garden work on flowers and the mom elbowed me in the gut, she said she was taking out bad weeds and it was accidental and this time It kinda hurt aswell (I didn't expect her to have such force) and I acted like It was nothing.

I feel like they are testing me and they keep speaking Japanese together when I'm here (the parents). Should I learn Japanese? Or another option? there's a poll

I tried moving on from her twice by trying to like other people and by using dating apps, but she still would cross my mind. She has my heart. Should I tell her that I’m in love with her? She already knows that I have feelings for her, but I haven’t told her that I love her. Keep in mind we’re not together or dating. We’re friends and have a lot in common. We see each other all the time. I’m asking because I don’t want to make a mistake. I don’t know, if girls like to hear this from a guy.

I tried moving on from her twice by trying to like other people and by using dating apps, but she still would cross my mind. She has my heart. Should I tell her that I’m in love with her? She already knows that I have feelings for her, but I haven’t told her that I love her. Keep in mind we’re not together or dating. We’re friends and have a lot in common. We see each other all the time. I’m asking because I don’t want to make a mistake.