I'm planning to continue my relationship even though I have no intention of marrying my girlfriend.
Why would you lead her on like that?
I like being with my girlfriend, but I don't want to deal with being married. It seems like a hassle.
You shouldn't mislead your partner when it comes to marriage, as marriage is something most people take very seriously. If you pretend that you're interested in getting married when you're not, your partner will eventually find out and feel betrayed
I don't care. Marriage is a big joke.
Maybe it is to you, but your girlfriend likely feels differently. As soon as she finds out you've been leading her on, she'll probably break up with you. You should be upfront with her now so that she can make the best decision for herself.