Search Results: giving this girl too much

So if a girl has sex with a guy pretty quickly, he pretty much writes her off as someone he can't be serious with, most of the time. And you notice that when guys kinda at cold towards a girl in the beginning, she seems a lot more interested in the long run. So I'm just wondering if the reason a guy gets the "I don't want to ruin our friendship" speech, is because we give up our emotions to her way too soon.

So my girlfriend went to a party where there was a lot of drink and she got pretty drunk. There was a lot of people at the party that I knew, both male and female so several of them have told me exactly what happened.

Apparently, towards the end of the night she sat on another girl's lap and they started kissing. It soon turned into them making out, as a bunch of people started cheering them on. They also had their hands all over each other and the other girl took my girlfriend off to a bedroom.

After confronting my girlfriend about it, she has admitted it but claims they were too drunk to do anything and that they only heavy petted each other through clothing, although I kept going on at her about it and she also admitted to giving the girl oral and the girl touching her down below, under her panties. But she then took that back and said nothing happened at all besides kissing and touching through clothes. And she keeps insisting that they were too drunk to do much and ended up passing out. She says she doesn't remember most of it.

She is upset and has been crying and insists that she didn't know what she was properly doing, because of the alcohol, and that she regrets it. She has apologised multiple times and tells me that she loves me and isn't interested in women, but I don't know what to believe now. I'm not sure what to do?

So I have been getting to know this girl for about 2 months now. We have been planning to go to this fancy play of Frankenstein from about the start of October. Yesterday was the day of the play and I texted her the day before to see if we were still on for it, she said we were. Then day off she said couldn't make it since she was low on funds and was tired from work that day. Even though I offered to pay for her. She said we could just hang out instead. I was bit disappointed but said sure. A few hours later she messaged me to back out all together since she said she was too tired. She didn't try to reschedule or anything. I was super disappointed since I even bought her a small present for Halloween, a funko pop vinyl of her favorite horror movie character. I was planning on giving it to her that night since she seemed to have had a bad week before. Having her cancel on me not once but twice in the same day just makes me feel like she isn't really interested in me. I mean it clearly didn't mean as much to her as it did to me. So what do you think, does her actions her show she isn't interested in me?