Why do I feel so used and worthless?

So I had a boyfriend for a long time, and it was pretty serious. We wanted to get married and everything later in life and EV everything was perfect. But later in the relationship he seemed to only want me for my body and not myself​. He kinda acted flirty around other girls while I was there and everything and I was fed up with it (it went on for a month or two) so I ended it. He tried to get me back for months and even pretended he was someone else to prove that I still like him. And I did, I still loved him. So I agreed to talk again, and we became friends, and then eventually got back together. But now he only says Ily when I send nudes or do stuff with him, and he just told me tonight that he doesn't know if he loves me anymore... Why do I still love him? Why doesn't he love me anymore? Did I do something wrong this whole time? I don't understand this. I just want us to be together how we always wanted to be...
Why do I feel so used and worthless?
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