Trust isses with my girl: she goes out clubbing every weekend and suspicious texting

[powers]

I am 26 years old. We have been dating for a year. I dont drink or smoke. My girl is 22 years old. Likes to smoke and drink. I work late every saturday night, and she has saturday nights off. She goes out dancing with her girlfriends EVERY saturday night.

During the first 11 months of the relationship, I had no problem with her going out. Last month she lied to me about giving her number to an ex boyfriend that literally told her he is trying to sleep with her again. He was sending her text messages that literally said "i want to hook up again", and instead of her telling him to stop, she let this go on until I found out (she got a text at 2 in the morning and I asked who it was). She told me that she didnt tell him to stop because she has been friends with him a long time and didnt want to be mean (which i think is not logical answer). She never once mentioned in the text messages that she has a bf.

Last week I picked her up after she went clubbing and she was drunk. She was with a bunch of girlfriends and one guy friend who tried to hook up with her 4 years ago. When she said goodbye to the guy, she hugged him and kissed him on his neck (not passionately, but a peck). That guy called her at 3 in the morning the same day. I think she sent the guy mixed messages by kissing him on the neck, and that is why he called her at 3 in the morning.

I believe that girls need to be able to go out with their girlfriends and dance and have fun. I realize that she is in the prime age to do that. She told me that when she goes out, she doesnt let guys grind on her. But when I went out with her 3 weeks ago, I was dancing with her and 3 different guys came up WHILE I WAS DANCING, and started dancing with her. I had to tell them that she was my girl. That got old real quick.

I believe that when she goes out, she is going out to have a good time, and NOT LOOK FOR GUYS. But after seeing her kiss that guy on the neck RIGHT IN FRONT OF ME, it has start to make me wonder what she may be doing on the dance floor when I am not there.

My questions are:
What do you think about the text messages?

What do you think about kissing the guy on the neck?

Do I have a reason to question the trust in the relationship?

[misombra]

What do you think about the text messages? -they want to **** each other.

What do you think about kissing the guy on the neck? -they want to **** each other.

Do I have a reason to question the trust in the relationship? -yes. the question is, will she go along with it or will she quit.

if she doesn't quit soon, leave her alone. she's young and likes to have fun.

[powers]

Thanks for the response!