Am i the bad person in this?

Instructions

Things between me and my gf have gotten worse. On Friday, she was hanging out with some dudes in the morning. Of course, me being the loser that I am, I was slightly jealous - what made it worse was that one of them was the dude on Wednesday (in short, the dude SMASHED a friend of my gf's phone), so that was weird. Anyway, she said "Oh, we're cool again" even though what the dude on Wednesday last week did was horrendous. And another thing, she was getting h@ndsy with a male dude (who's her neighbour), and said "Oh, he's just my neighbour. We talk a lot and hang out most weekends." So, the jealousy grew a bit more. That lunch time on Friday, she said she had to go friend a female friend of hers, so I looked after my bag and hers... Turns out, she just went to hang out with her "just friends" neighbour. For 30mins, I sat at the same place. Alone. Bored. She also didn't speak to me over the weekend, so that was sad. On Monday, it was a swimming carnival, so me and my gf could spend the whole day together - she even promised we could! But, of course, for the first TWO HOURS she spent it talking to her "just friends" neighbour about some pretty... Bad topics (if you catch my drift), RIGHT BESIDE ME and her female freind. Then she walked off with some friends to the bathroom, and stayed in there for 30 minutes. I sat alone once again, with my gf's female friend. We talked for a bit. Then, my gf finally came back but had to do something, so she walked off. After a few minutes, we finally walked away from the main group of people and off to a secluded side where no one could really care where we were. I was finally happy... but her "just friends" neighbour came over and we (him and her) talked. He finally left, and me and my gf finally got to have alone time... But, she didn't want to do anything (I wonder why!!!), so I just sat there. We sat there while she was on her phone for 30 mins, then we went back to the main group of people. After a bit, my gf and the "just friends" neighbour walked off for 1 AND HALF HOURS together, leaving me to look after my stuff and hers again. Fast forward to yesterday, and they were sorta h@ndsy again that morning, and she was wearing his hat, saw me, and immediately took it off. She said hi, and then her female friend arrived, and they walked off. So, I went over to my other friend group and hung with them for a bit. My gf finally came back, and I walked over... only to find her and the "just friends" neighbour talking about hanging out this weekend. So, I walked off and she didn't notice me. I was gonna surprise my gf with us hanging out this weekend, and a date on the Friday (it'll be our two months), so that was nice. We also barely spoke yesterday, and the same lunch time thing happened again - she walked off and I looked after our stuff again. And then this morning, she finally said hello to me but walked off to talk with her "just friends" neighbour, leaving me alone. So, I walked over to my other friend group... and she got up me for doing that. She also said "Oh, am I not allowed to hang out with friends!?", which made me feel bad. That brings us to now. Sorry if this is too long - a lot has happened.