I'[m]22 and I had feelings for a 17[F]riend with benefits, I don't know if I made the right choice in ending it

As my reddit name suggest it, I'm french so my typo might be ruining your day. I apologize in advance.

So there's this girl, we met through work 5 months ago and I started going out with her while she had a boyfriend. She was only looking for sex in this relationship and she made that very clear.

However, during March she starting to act more "girlfriendly" by putting "<3" and such in her messages, the tone was more cute etc. Also, she dump'd her boyfriend. So I started to get attached (not in love but could have)... She made very clear that she didn't want anything another time.

NOW the situation of March-April was : I tried to see her, she always had excuses "I work a lot" "I'm off ski-ing"... . I didn't harass her btw, I asked her mb once a week, if she was available. Not the creep guy, I was keeping maximum distance not to "piss her" off or anything. So yeah we didn't see each other for a month, we spoke way less than before.

Today I took a big step and... decided to delete her. I felt treated like crap while I was doing a lot to please her. I invited her to movies, taking food, I was always driving to get her etc. So yeah, a few hours ago I deleted her from everything, I don't want to hear about her anymore. Upon deleting her, she texted a little and she really doesn't change her mind. She said I "agreed" to have low priority in her life, hence the fact that we didn't spoke or see each other for a month. HOWEVER, she was sending messages like "I miss you, and not just sex, I miss YOU Firmin :(" and... God I feel like she was playing with my feelings....

TL;DR : Started a "friend with benefit" relationship with a girl... she started acting more girlfriendly so I kind of got attached and then we almost stop messaging or seeing each other for one month. Now I deleted her, am I right in this ?

I'm posting this because I really don't know if I made the right decision in ending this. Was she really treating me like a sextoy she could use whenever she wants ? That's what it felt like, but then, why the cute messages..