This is long but i'm REALLY UPSET like CRYING so please i beg of you to help me!?

My boyfriend and I went on a vacation valentine’s day until today. I just recently got home. I am a very fun person who likes to have a GOOD TIME! I love water parks and my boyfriend decided since its winter to bring me to an indoor one. Well we got a suite at this place about 4 hours away. We ended up bringing my boyfriend, his brother, his brother’s friend, his younger brother, his younger brother’s friend and his younger sister. I didn’t have a problem with it considering we had our own “room” within the suite. Any who…we got there and all of a sudden these two other guys showed up. They were best friends with my boyfriend and lived in Ohio where my boyfriend used to live. When we first planned this trip 6 months ago it was supposed to be JUST US! Well we went to the water park and at first he was all about me. I enjoyed myself. He rode the tubes with me went on the slides with me was all cuddly and just perfect… then all of a sudden he made me ride some of the water rides by myself which I didn’t mind...much and was playing basketball for like 3 hours. I kept asking him if we could do something else and he told me that his friends wanted to play basketball. After that we went to this disgusting place to eat. I hate chicken but because his “friends” from Ohio wanted to have chicken it was where we went. I asked if the rest of them could go and him and I could have a nice romantic dinner instead just the two of us. He insisted we go get “bbq chicken from some bar.” I had a few drinks shot some pool and ate I’d say about 3 pieces of chicken AT THAT and to top it off I had to PAY FOR MY BEER! HE AND I ended up sleeping on the FLOOR because there weren’t enough beds. I was SO UPSET!! AND aside from that he took the sleeping bad and made me take a blanket from one of the beds and use it as a sleeping bag. I was FREEZING the whole night! AND REALLY UPSET THAT he let his friends stay with us CONSIDERING they lived only a half an hour away. Well the next day we were going to go to the water park but my boyfriend refused. We got there and he left me there by myself! I ended up having to ride water rides with a 16 year old mind you I’m 23!!! I called him NUMEROUS times to see where he was and he told me his was with the guys in the weight room. I went there and told him we needed to talk ALONE! Well we walked around for a little bit grabbed some pizza and then that was that. He THEN admitted to me that his MOTHER was paying for this vacation and it really wasn’t HIM who was paying for me it was a gift from his MOTHER because he got into Med. School! I was shocked and a little insulted. He then told me that he was sorry and hoped I wouldn’t get upset but he hadn’t gotten me anything for valentines day…”This was supposed to be the “gift” for me” but apparently he didn’t get anything for me. Later that night I saw him texting this girl. He was constantly texting her and I asked him who she was. He told me she was just a friend he met about a week ago through another friend. I found his phone and read his messages it seemed like harmless talking. I asked him if he had feelings for her and he said “yes” but it’s nothing more then feelings. I couldn’t understand what that meant and throughout the car ride home today I wouldn’t speak to him. We were supposed to see each other tonight but INSTEAD he made plans with this guy he’s friends with and hasn’t talked to me since and this was about 3 hours ago! Tomorrow he is having a poker game and asked me if I could “stay home” because it’s just for the guys. Would you dump someone if they treated you this way? WHAT SHOULD I DO?? I’M SO UPSET!!! I don’t know what to think! This was supposed to be romantic and great vacation….what should I do??