Will a guy take me seriously if I hooked up with his best friend a few months ago?

Anonymous
Trying to decide if this guy is taking me seriously. I'm a pretty serious, nice, and an attractive young woman, I've just had bad luck with guys. Most recently, I casually dated this guy for about a month, wasn't feeling him and he was feeling me TOO much (and the sex sucked)... Last month I asked his permission to express my interest in his best friend. He told me how much he respected me for asking permission yadda yadda and it kind of worked out. The friend and I went on a date, which I though was successful. But I didn't hear from him for over two weeks. So I asked the friend why that might be. He said he wasn't sure but that I should hit him up again. So I did, within a week we we hung out again. He's a really sweet guy but I may have messed up by sleeping with him (too much Jack)... But either way, I don't consider myself a slutty person. We now have plans to hang at my place while he cooks. Is there a chance that this guy will take me seriously? I'm not into casual dating and I will end it quick if I begin to get the vibe that he isn't looking for something serious with me. I'm a 22 year old law student and ain't nobody got time for that! Plus I'm a really sweet person. (P. S. over 3 years ago I also dated his frat brother, the first guy knows all about it and told me to keep it to myself. I'm not ashamed of it because any guy I've ever dated wanted a relationship with me, and I wasn't into them enough for that... But I certainly think I may be into their friend in that way... So I don't know what to do, end it in fear that he won't take me seriously because he thinks I'm a hoe/homie hopper or see where it goes and hope he'll take me seriously)
Will a guy take me seriously if I hooked up with his best friend a few months ago?
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