<human>: Can you provide a brief overview of the text?

I've [26M] been with my GF [25F] for a year now. When we first started going out she wasn't looking for a relationship. Since then we've grown into a couple, met eachothers parents, and gone on vacation together. Things in general are going well.

However, she's secretive with her phone (full disclosure: I did snoop before and found nothing), goes out to drinks with coworkers, and went on a vacation without me recently where I know she was flirting with guys but nothing else happened. 

Every day I'm just freaking out thinking she's going to cheat and leave me. I am head over heels for her and I know im coming off as controlling and needy but I can't stop. If I don't hear back from her for a few hours I start getting super nervous. I know she's a flirty type of person I don't think she would cross the line but it scares me that she might and I don't think she would tell me.

I'm considering talking to her this weekend and potentially ending it. I hate feeling this way and its driving me crazy.

I'd like to just ask her straight up of she's interested in continuing our relationship or of she wants to see other people. She said when we first started dating she could see a future with me but she still wanted to meet people and be young. One thing to another and now we're in a relationship but I just get the feeling that she still wants to talk and flirt with other guys and ibdont want to get hurt.

Whats the best way to bring this up?
<bot>: GF is flirty by nature and I'm insecure. I think she secretly wants to see other people. How do I talk to her about it?