Tricky situation

So I liked my friends sister a while back (April). Shes the grade below me and im 13. I liked her a lot. Id think about her a lot, I loved her eyes, and shes really pretty. So I decided so deserved to know the truth, and I told her how I felt. She was cool about it. When I got rejected I cried a little. I asked if we could not tell my friend but she said he deserved to know. I told him, he said he didnt care, and actually laughed. She got a bf soon after and I was really sad, but it was whatever. So fast forward to now, (this happened in April) me and my friend have hung out 4 days straight, Wednesday night her bf broke up with her and she came into my friends room, (he had another friend over so there were three of us) and we all talked to her and comforted her. The next day I texted to ask how she was doing. Fast forward to Friday. We had a pool party and she was there. My friends said "stop doing that or you like my name" (stupid middleschool classic thing to say ik) and I talked to her more abt what happened between her and her ex bf (she spoke to me first) then texted me what she sent him after. I realized I may still have some feelings, but I have no clue what to do. Help me out here?