A lot of people don't like to be talked to much, nor have lengthy conversations.
If you talk too much, unless you find someone similar as you...a large portion of people will respectfully tune you out and respond with the bare minimum...in an effort to get you to take the hint and end the conversation.
People have things to do, and things they need to/want to focus on.
A large portion of people don't want to be spoken to in lengthy seemingly never ending conversations.
Find some similar individuals who want to converse in lengthy fashions...and who wouldn't mind listening.
If your boyfriend is ignoring you about the really important things, and things that need sorting out, drop him.
It's an individual thing. Some people are mellow, chill, and can't handle lengthy conversations.
Also, you have to learn how to respect people's time, space, and energy. You have to know when to end conversations at an appropriate time, you have to access engagement and interest of the person you're conversing with...and the person in general...you have to learn (if you don't know already) appropriate timing when to have these conversations...don't start if you see them trying to relax, busy with other things, trying to focus on the telly, just coming in from someplace, etc...
It's kind of disrespectful, controlling, and abusive that you know that he doesn't like lengthy conversations. You know that he tunes you out respectfully ..but you still are insistent and adamant about continuing.
If you need more of a conversationalist, and are unhappy with this..end things.