Okay so basically I had a fling with this guy a few months ago, and I really liked him, but he decided to break it off after only a few weeks. However, we stayed friends and hung out a lot, and I tried to make a move a few times, but he always (gently) rejected me. On Christmas, we spent it with a few friends, and since we were the only single people there, we ended up talking all night and he kissed me. I was very happy, because I thought it meant that he was finally ready to get back together. We started texting more and more, and I should be happy but I can't help but have a bad feeling.
You see, the guy (let's call him G) is generally a very friendly guy, he has a lot of girl friends and I usually don't mind, but there is this one girl (let's call her S) I cannot stand. G denies ever having any feelings for her and he always reassures me that they are just friends - good friends, but I don't really believe him.
We went to this NYE party, and S was there, and even the dumbest person could feel the tension between the two of them. They were always talking on the side - alone and touching each other (hugging for no reason, slapping each other, touching each other's faces, etc.). Now, he did not ignore me for her as he actually spent more time with me than her, but he always kept staring at her even when I was there (even when we were slow dancing, his eyes were on her!), and at one point, he even left in the middle of our conversation to go talk to her. When it was midnight, I tried to kiss him, but he rejected me and kissed me on the forehead really quickly instead. I thought that he was just shy about kissing me and showing affection in public since we never actually made anything official, but then I saw him a few minutes later with S, engaged in what seems to be the most intimate hug ever in front of everybody, I could see how happy they were. I tried to see if he hugged his other friends like that, but no, he only hugged S like that. Plus, whenever we hang out with other people and S isn't there, G and his friends always seem to bring her up, ex: "Oh S told me that..." or "Yo we should have asked S to come" and things like that.
I know he likes me, because he's very nice to me and always acts like we are a couple when we are alone, but once S is there (or mentioned) he changes instantly. I know we never made it official whether we were back together or not, and I want to know if I should continue talking to him, hoping that they are just friends or if I should end it there, before I get my heart broken.
Thank you guys.