I’m basically living with this guy now. I keep saying “guy” because it feels too soon to call him my boyfriend or say we’re actually dating. It’s still kind of a getting-to-know-each-other thing, but we’re also fucking and pretty much living like a couple lol.
You guys are a couple. I think you’re safe in calling him your boyfriend.
Very easy way to test- how would you feel if he went out and had sex with someone else? How would he feel if you did?
If it’s a problem for either of you, that person thinks it’s a relationship. If it’s only a problem for one of you, that’s definitively a problem for the both of you.