I (20F), don’t understand how my flirt (22M) feels about me

We aren’t official but I really like this guy. I’m not sure how he feels about me since I’m not good at reading signs and asking questions. When we had intimacy he kept smiling at me but when we finished he started acting all goofy and weird. He’s usually a pretty strict guy who doesn’t joke about stupid stuff over and over. Is it because he feels comfortable with me now since we had intimacy or he just doesn’t try to impress me anymore so he acts whatever he feels like despite being cringe since he got his way with me?