I'm going to leave my boyfriend to eat alone in a restaurant
What is your reason for wanting to leave your boyfriend in the restaurant.
I'm not going to share my food with him; he will order his food himself
It doesn't make sense to eat by yourself in a restaurant. People will think you guys are weird being at different tables.
Oh my do you think I care appearance is important? What's the big deal of eating by yourself. This is what I want, who's gonna stop me.
Well if that is what you prefer than it is fine. You are free to do whatever you would like when going out to eat as it is an occasion to enjoy yourself anyway.