Is it wrong ?

Ok so this summer I have to attend summer school because I applied for this really amazing charter school ( it's basically a school to better your future; you have to have good grades) and when I applied I had straight A's but the last quarter of school I slacked off a lot in math class and it brought my grade down to a c so in order for the school to let me attend I had to take the summer course to gain a few extra points that way there I have all the credits I need!! Anyways in summer school each class is really small there's about 10-15 kids in each classroom and there was this boy that I sort of started talking to but I wasn't really into him I kind of just would ignore his text messages and only talk to him in a friendly manner when he would try and flirt with me...I'm not gonna lie the first week or so i was flirting back with him but only Because he is a good looking kid and he was really sweet but he has a very dull personality and for me I'm all about personality!! Looks don't mean a lot to me so I wasn't going to keep talking to him because of that, I slowly started distancing myself and a about a week ago this kid Eric who is also in our class started flirting with me and asked me for my number and I gave it to him because he honestly is the sweetest and funniest person I have ever met...he always finds away to keep a smile on my face and When I'm around him I forget about all the problems and tough times I'm going through!! And it's just such a relief! He's so different from the rest..and I'm slowly started to fall for him! But the only problem is he's the guy that I was "talking" to before really close friend..and I don't want to start any problems between them and I don't want to be called a hoe or anything! I'm honestly really stressing it..I told Eric not to tell the other kid but I don't know how much longer he's going to be able to hide the fact that me and him are talking!! Do you guys think that this is bad idea? I don't wanna lose Eric but I don't want the drama...