Hard questions maybe girls can answer pls and help?

in my old school that i left 4years ago i liked 2 girls and they did too i think (lets call them L and M) when i went to the school again i saw L and when we saw each other it was just like ( there's something about marry and she looks like her too ) and she invited me to her birthday party and guess what we didn't say a word in it to each other except happy bd while i was leaving and about (M) i saw her there too but we didn't talk at all but later i found her on fb and added her then we chatted a little and i told her i regret not talking to u and she said that means alot to me but now when we chat i always say hi then she replies and the regular talking then she ignores me and dont reply back please tell me what i should do with both of them