Would it be a bad idea to stay another day or two for my boyfriend?

I’m visiting my bf and it’s my last day =(. I’ve been here for almost 8 days and he really wants me to stay. I have the money for another ticket back, but I did spend a lot on my trip here. My parents are expecting me home and I do work for them and they are flexible. They probably won’t like that I’ll stay longer but it won’t be a big deal.

I want to stay but I feel like I have to go back on the day I told everyone I’d be back. I do want to stay but I think it’s more of me not wanting my parents to think I’m weak for my bf. even though we been together for 4 years including 1½ year long distance.