Is it jealousy, trust, or true concern?

I've been dating this girl for about a year now. I had just come out of a marriage with a woman who ran off with another guy. She was not the typical girl I date but I've fell in love with her. She would get jealous because she always thought I was looking at other girls though I did not. Lately we've had issues because she thinks I'm jealous. I'm trying to see if my feelings are warranted. She was married before too. She had pursued me heavily before I gave in. Well she has a pile of Facebook friends that say "inappropriate" things. I've always told her that I think she is too nice to guys she never sets them straight. She was in a relationship with a younger guy like 22 and she was like 38? Now we're together and she's 42 and I'm 43. Well she works at this bar and a guy was talking to her a supposed friend. Well I was not good with it. Well when she gets off the guy all goes up and tries to grind with her. I got pissed and we had a fight over it that night. I told her that she gives the vibe that she's available that's why this stuff happens. She says I'm insecure?!! She assures me that she's with me and not to worry and I'm sure of that but I don't trust guys around her. This is our dilemma now. The other night her daughter had a birthday party and some of her friends were invited. A young guy there of 15 was obnoxious and hugged my gf for like 10 seconds all like "joking" around oh baby stuff! I was not good with it. She said that she wasn't gonna make a scene at her daughters party but she didn't do anything about it. I felt like it was very inappropriate. My concern is that my gf and I are both young at heart and I think she's interested in hangin around with young people?? She says I'm stupid to be jealous of a 15 year old but he's reached puberty and knows what he's doing. My gf and I are both young looking for our age and attractive to put it in perspective. I just wanna know if I'm overreacting??

No ! Those are the guy code red flags in a relationship.she keeps showing her card.you have to play the card how it's delt @ not get your feelings involed once you see the card that's being played.in to days world when a women tells you there just a friend,that means that's someone else she involed with (friends wit benifits is wat its called)learn the game