How can I control my obsession?

[Jonah]

Maybe try to get interested in things that are only somewhat related to her (for example, maybe she likes to swim. You could swim. Or if she likes to read certain books, you could read them).
Try to come up with a limit of number of texts and messages that is reasonable and stick to it (ask her what's a reasonable number). Write texts and don't send them (don't write them on your phone). Do a drawing or something.
It's hard to stop obsessing but the more you can bring in other things, the more chances you have to get interested in other things.