He longs for your closeness because your two characters compliment each other wonderfully.
Your strengths absorb his weaknesses and your warmth soothes his temper. He feels a deep connection between you and would like to take the next step towards a common relationship with you.
If you also feel that you are like yin and yang to each other, you should openly invite him to your side.
For more detailed information on topics like love, career and more, check out The Strength.