<human>: I'm an 18 year old male who only had 1 relationship. I am generally a quiet guy in front of acquaintances and friends but can be very talkative with good friends. Lots of people say I am quite good looking and have a great personality. Girls are usually very happy in my presence. My biggest problem is that I am very passionate to my good female friends, but I become so cold and lost when I am with someone that I like.

Recently, I went on a trip with my friends and met a lovely girl [17F] that I like. Our relationship became quite intimate to the point where she holds my arm when she feels tired, hugs me when she's down and puts her head on my shoulder when we sit together. During our trip, I never initiated contact with her. It was always her that came to me. I just kinda went with it as I don't know what to do around girls that I like. Our trip lasted 4 days and we each went our separate ways. After that, she never initiated a conversation with me. Later on, I went on trips with her and my friends again, but she barely talked to me and never showed the affection that she once had towards me.

I was devastated as the I felt the same case happened with my ex. What should I do if a girl shows even a tiny sign of affection towards me?And is there any chance I can get that girl back?

Could you distill the essence of the text into 1-3 sentences?
<bot>: Fun guy in front of female friends but a pussy in front of someone I like. Screwed up my chances with 2 girls because I don't know what to do. Need advice on how to make a girl stay.