<human>: I'm 21 (f) he is 21 (m) - together for one year

We've known each other for 5 years now and have been best friends for the majority of that time. 

He left his ex-gf for me

Now she wants to be his friend and he is ok with that. She texts him on a pretty regular basis and it goes on for the entire day. She is in a relationship herself, but she just now got around to deleting all the pics that she has of my bf, she said that it felt "bittersweet" - I get that... but why put that on facebook for everyone to see is beyond me.

Anyway, I am not ok with the friendship. I know that she's not over him yet, but he doesn't see it. I am ok with them talking every once in a while to catch up, but her planning private hikes, coffee dates, etc with him is inappropriate in my opinion.

I've talked to my bf about it and he said that he will fix it, but I just want to know if I'm being irrational. 

Any advice is welcome.

Can you give me the gist of the text in a nutshell?
<bot>: my boyfriend wants to be friends with his ex and I am not ok with it due to the "closeness" and the "alone-ness" of it.