Okay i could use some advice (from someone whos good with relationships)?

the thing is im dating this unbelievable girl. I dated her once for two months, and we broke up cuz she said it was easier when we were just friends. i guess i had trouble being myself and that was that. then we started talking and ae dating once again. we are way more flirty and we do way more stuff together. but lately, it almost feels like it was when we first dated. the phone conversations had been really more quiet, and iam afraid that i might go back to my old ways. How do i go back to when we were flirty and were so good? Do i say something different? what do i do?Okay i could use some advice (from someone whos good with relationships)?
I know she may be unbelievable; however, if you have to force the conversation then there is something wrong with the relationship. She may be a great girl, and you are probably a great guy. The truth, however, is that you two just may not be compatible with one another. If you try to force something, then you will end up hurting one another terribly. I would talk to her about things. Get her to be open and honest with her. Ask her how she believes the relationship is going, and be prepared with your own answer to that question. Sit and discuss things. The big question you two together have to figure out is this -- is there a future? If the answer is no, just be friends and accept that.