Do They Love Me?
I find the wording to this question a bit weird. How is it possible for one to "insist" that they love you but can't openly say it to you? Is it because you're asking your loved one, "Do you love me?" Which gives them the power to simply reply, "Yes." Is it that they do say they love you but you don't pay attention to it because it's not the way you want it? I would need a little more incite to this situation, because they way I am understanding the question I only have one answer.
When you're in a loving relationship, then none of these questions should come to your mind at all. When a person loves you not only do they say it, show it, and feel it; they won't make you feel 'questionable' about their love. If you are feeling there is nothing there at all coming from your other half, then why are you there? Leave! It's the best thing you could do. You wouldn't have to stress questioning your relationship like this.
On the other hand, are you one of these people now and days that has a cloudy perception of what loves is? (I would hope not) These people expect too much! They have these delusional expectations of their significant others; instead of taking it for what it is; love. The reality is this person is with you, they are by your side; through everything, thick and thin. Not, are they saying, "I love you," enough to satisfy your love needs. The same thing applies to showing it; what is it exactly that they need to do to "show" you love? Or should I say what you want them to do. Stop trying to live in your fantasy land of your expectations of love and except your loved on the way they are.
Maybe you could just move on to another person who meets your "Love Expectations."
Ever heard the song by Dusty Springfield, "You don't have to say you love me?" The next line that follows is, "Just be close at hand." Not that the whole song applies to this situation; just a thought.