He doesn't know if he wants to stay or leave. What to do?

I have known him for 10 months now. We have been talking a lot and became very close, at least for me. I fell in love with him and he for me too, at least he says so. The problem is that we are very different and sometimes we don't understand each other. Due to this, we have had problems and I have left him 2 times. Every time though, I came back to him. Now as we started to talk again, he has hesitated and has talked only about fwb-relationship, not a serious one. Obviously, he doesn't want anything serious anymore. I asked him, does he want to leave? He said he doesn't know :( I feel very sad. What should I do?

He doesn't know if he wants to stay or leave. What to do?
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