Sometimes a guy is really nice... and really not for you. He may be good looking, caring and say all the right things. But if you don't feel a spark, that's not going to add up to love. Here's how to let a nice crush or boyfriend down easy.
Tell the guy you enjoy spending time together, but for whatever reason, you just don't feel the love spark. You can put the blame on yourself to make him feel better ("It's not you, it's me").
Don't give the wrong impression that if he works harder, or does a certain something, he can win you back. Explain that you care too much about him to ever lead him on, or make him feel like the relationship has a chance.
Just because you don't feel the heat with him, doesn't mean another girl won't. Let him know that he's a great catch. Tell him it's just a chemistry thing, and you know lots of girls would be so happy to get a chance with him. Be encouraging about his possibilities of meeting someone new.
If he asks you detailed questions about the relationship, and the answers would make him feel bad, be kind and don't share. After all, he's a nice guy, and he probably bruises easily. For instance, if he's a bad kisser and he asks, "Is it because of the way I kiss?" - just say, "No, I just don't think we're a good match." Avoid answering any such questions, and then reassure him that he will soon meet someone who can care for him the way he deserves.
Don't in any way make your guy feel like the breakup is his fault. Even if it was, let him leave the relationship believing it was a poor fit between the two of you. Doing this is kind, and it reflects well on you that you can exit a relationship so maturely. Besides, it's always wise to avoid making enemies. One day, your ex might have a hot friend to introduce you to!
Once you've delivered the news, don't keep getting physical with him. You may think that's obvious, but beware of risky situations. For example, you're dateless at a party the weekend after the breakup, and he's there. It might easy to slip into kissing him again, because he makes you feel comfortable. But doing so will make him believe there's a chance to continue the relationship. If you have no intention of really dating him again, be kind and don't go back for seconds.