WIBTA for confronting my friend when she's heartbroken?

For context, my friend has a really bad habit of falling in love with a guy after a week. It's like a monthly cycle that always ends with the guy breaking things off and wrecking her self-esteem until she meets the next one. I do my best to always be there for her and talk her through it when this happens.

My ex and I had been dating for almost 3 years. Long story short we had to come to a mutual breakup a couple weeks ago. It was incredibly difficult for me, and my friend was aware of this but when I tried opening up to her she would just go on her phone or change the subject to the guy she was talking to.

The breakup came and went and she knew about it, but she never once checked in on me. We would always come to each other for our emotional problems so it really stung to go this breakup alone. To be fair, I didn't reach out to her about it, but after our conversation I got the vibe she just didn't care. The next time I saw her, I brought it up and she gave me full attention. But she never asked how I was doing unless I brought it up, and was lowkey dismissive about the whole thing. I figured she didn't want to be as close anymore, and moved on. This was a couple weeks ago.

Recently, her situationship of 2 months ended and she's devastated. We haven't talked this whole time, but suddenly she's sending me all these texts about how she feels she's unworthy of love and she's scared she'll never find happiness. I know she's hurting right now but I just can't muster any empathy for her after how she treated me. I can't get myself to respond to her texts, but she's very sensitive and is going to be very very hurt if I continue. I want to confront her, but she does not take confrontation well and I know it will double her heartbreak. I feel so guilty, but I can't keep this friendship up without saying anything. Any advice would be great.