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Your girlfriend has trouble trusting men. How can you convince her that she can trust you? You can't convince her to trust you. What you can do is be trustworthy.
The most common complaint of singles is that they are lonely. God didn't design us to live in isolation. Intimacy is one our deepest needs. If you're single, invest your time with others. It's the language of friendship.
Are you attempting to improve your marriage by trying to change your spouse? Matthew chapter 7 tells us not to judge others. Examine yourself and see if YOU are the one who needs to change.
Are there fireworks in your marriage - the fireworks of romantic love? When you speak your spouse's love language, you'll touch their heart.
There's something about the way we're made that cries out for intimacy. God designed marriage to be the most intimate of all human relationships.
Listening is the key to good communication. If you listen to your spouse and try to understand their thoughts and feelings, your marriage will thrive.