Are you opening up to him? Ask him why he thinks that, and communicate with him about it, even if it seems cheesy.
Need Help I have a boyfriend and we have been together for almost 4 years and we're literally in love but for a sudden he thinks i don't love him like before , how do I prove to him that I do really love him and he is totally wrong?
If you've been in the relationship 4 years ... Why aren't you married?
To answer your question, though ... If you have tried talking to him, you don't "prove" anything if he still doubts you. Try going to counseling, as a couple.
If 4 yrs of a relationship isn't enuf to prove yor love, then nothing ever will b.
My advise? Cut him loose and move on with your life. That in itself may b enuf to change him, but don't go back unless he HAS changed.
Relationships have an "Eb and Flow as you Grow" . . . Meaning "While the Feelings Remain the Passion doth yet Wane" . . . Oops, rhymed again.
All I'm saying is that physical contact tends to be more frequent and intense when you first start up because it is fresh and new. There is a certain "Discovery" period for new couples and everything still seems fresh and romantic . . . But as time goes by (4 years is actually quite long), you tend to get in a pattern . . . Less passionate kissing, and holding of hands. This is PART of what people talk about when they say a relationship takes work.
Try something NEW together . . . Do a hike . . . Try a ethnic restaurant you wouldn't normally try . . . Sign up and take a gun class, or pottery making class . . . When you discover something NEW together, you can achieve a tangent to the normal ruts you may find yourself in.
This is a life lesson worthy of the word "Wisdom" . . . Embrace it or run from it . . . That is part of the lesson.