My girlfriend is starting to like someone else. We are both working on a ship and apparently I noticed that she is starting to like someone else, one of my colleague. She even told me that this guy is so sweet, and like a model, and that really pisses me off, but every time I ask her is she likes this guy she keeps on saying no. But I always caught them how they look each other, and even searching each other every time. So I really don't know what to do. If she's telling the truth or not. If she's just being friendly, or something is going on between the two of them. Need some professional advice. Please help.

She don't know what she wants.. tell her how much you care and love her . Some girls just love to be a whore and do that but hopefully she's not like that. If you truly love her you will always be there as a friend or not , fight for her . And you can love as many people as you want but you can't be IN LOVE with two hope I helped

Never be afraid of competition, and never let the competition see you sweat, and NEVER, ever let your fear interfere with your relationship. How old are you and how long have you been together?

Relax and take her word for it, until the facts say different. Then you act accordingly. You have no facts from what you have written, just feelings based in fear and jealousy.

I think she's creeping on you, id ask her bluntly and if she says no then tell her what you've seen and tell her to keep it real to you.

If you have asked her and she has said no, take her at her word until she gives you reason not to.
Your insecurity can push her away, so get a grip on it.