<human>: I started going out with my ex shortly after meeting her for the first time, we dated for a year & a half without a single argument but found that we were drifting apart. So we decided it would be best to call off the relationship but remain friends. A month later we got pretty close again but did not want to get back into a relationship and so decided to be friends with benefits.

It continued for the past 5 months and was very similar to when we were originally dating. A friend of mine expressed interest in her and asked if I was alright with him seeing her. I knew I had feelings for her still, but didn't think they were too strong and I didn't want to get in the way of anything so I said I wouldn't mind. A couple days later while they were both at my house he asked her out and she said yes. He is moving away to London for university near the end of September and will be back around christmas so they're unsure how it will work.

The suddenness of his asking caused a realisation that I and her would no longer share the connection and closeness we had for the past two years. I realised my feelings for her were much stronger than I had thought since i've been unable to stop thinking about her for the past week, I know she still has feelings for me but do not know how strong they are. 

My question is, should I talk to her about this and tell her how I feel? I feel like bottling it up and telling no one is only making it worse.

Can you provide a brief rundown of the text in within 3 sentences?
<bot>: In a relationship for 1 & a half years then friends with benefits for 5 months, she suddenly began seeing a close friend which made me realise my feelings were much stronger than previously thought and am unsure whether to talk to her about it.