Nervous about bf’s family

So my bf usually comes over to my house which is fine with me and i think that’s how it should be most of the time since my parents get very scared with me driving at night. I’m 23 but they still get worried lol.

i’ve only been to my bf’s house once and met his parents very quickly and not formally. since then, he has not mentioned anything about if they said anything about me, nothing. and since then, i haven’t gone over the house. again, i don’t mind it this way but i just am a little concerned his parents didn’t approve of me. also, come to think of it- my bf got a little bit different towards me. he says i love you now but he is definitely a little less romantic than before. My bf and i are from different cultures. and i’m worried that his parents did not like me and now he doesn’t take me seriously. idk what to do. i don’t wanna head for heartbreak because i am dating for serious reasons. i’m 23 and do not wanna get married for awhile but i still take my relationships very serious as it could be a possibility. help.