All of you "The Simpsons" fans. Have you seen this episode and remember what the title is called?

I saw this episode not too long ago and it was something about Bart going into the future and he saw Lisa marrying the neighbor friend that has blue hair and wears gles. I think he might have even went earlier in the episode and saw the two of them date and thought to himself that it was all his fault. Anyway if you have seen this episode or can help me out by finding the title, that would be really helpful.