She still decided to stay with him. Why do I feel like I lost everything?

Anonymous
My boyfriend and i were together for 3.5 years and he left me for another girl. He kept coming back to me saying how he misses me and still loves me and wants to make things work but won't leave the other girl. The other girl recently found out that he is still contacting me and sleeping with me but she doesn't care and still wants to be with him even though he lied the whole time. Why do I feel like I've lost everything and he still gets her it's not fair. He's just happy that she still stayed and I've lost everything trying to make this work.
She still decided to stay with him. Why do I feel like I lost everything?
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