I want to break up with him...

I am a 29-year old woman and have been in a relationship with someone for over a-year-and-a-half. I think I love someone else but don’t know how to break up with my boyfriend because he loves me a lot more than I care about him. We enjoy spending time with each other, but I know I don’t have feelings for him anymore so, whenever we go out, it makes me feel like a liar because I have to constantly pretend to be very happy to be with him. It’s making me feel like a fraud and I end up saying horrible things to him just to get him to break up with me. It’s not healthy and I am worried that the longer I stay in this relationship, the worse I will behave towards him. I don’t even know if the boy I love cares about me, but I know that this isn’t working. What should I do?
You are already aware of what you need to do because your current behaviour is harmful to you and your boyfriend, and also unfair to you both. He doesn’t deserve to be in this situation, just as you don’t. Put aside the person you are in love with, for now, and be honest about your relationship with your boyfriend. If breaking up with him is hard, being horrible to him for no fault of his own is worse. Be an adult, take responsibility for your feelings, and act upon them.

Is it wrong for me to be in love with my best friend’s ex-girlfriend? I think she likes me too, but I have no idea how my friend will react if he finds out. He may even stop being friends with me, which is why I haven’t spoken to him about it. Is this a bad idea?
If you feel strongly about this person, you should be able to talk about it with your best friend. You won’t know how he will react until you do.