<human>: Can you provide a brief overview of the text?

Was housemates with a couple for a year. A year ago they broke up when he moved across the country. 4 months after the breakup she started spending every Saturday night with me (at the same house) and we eventually ended up in bed together but before having sex she stopped us and said she was betraying "him" and broke off contact for 3 months with me while she finished university.

Now she invites herself over once or twice a week for the last month and I'm developing the biggest crush. But don't want to make a move even though there seems to be every opportunity. I'm afraid of her pulling a disappearing act again. I think we both like each other and are both a little confused how the relationship has developed. She tells me things like she unfriended him on facebook a few months ago and also that she's ended things with her FWB of this year.

I like how things are now and don't even want to broach the topic to not rock the boat. But the crush thing is always on my mind now and is unsettling me.
<bot>: Crushing on ex-housemate from a year ago, get together for drinks and parties at my place every week, don't want to mention crush not for fear of rejection but for fear of damaging the relationship.