What does X mean?

hi guys, i just been texting woth a cute guy for a month now. unfortunately we couldnt meet yet cuz he's in London and i'm in Germany but when i was in London we planned to meet but he was truly sorry when he couldnt make it due to unexpected work.
Anyway it sems he likes me but i can't tell for certain.
How can girls find out if a guy they like also likes them?
And most importantly, if a guy texts "Blonde suits you x"
after i sent him a pic of my new hair colour, what does this "X" mean?
What does X mean?
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