He's not as much into me, as I am into him, what should I do?

Im not sure how much he likes me. We've been talking online for 4 months. The uncertainty and element of mystery is giving me anxiety. I'm not able to let go of him cause I think he's a combo of sweet and hot. But the long pauses between the communication doesn't feel good for my mental health. How do I let go? How do I end this?
He's not as much into me, as I am into him, what should I do?
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