Am I dumb for helping him even though his baby mother says he's begging her for sex?

So recently, I helped my boyfriend get his lights turned on and I bought him some furniture for his house. Oh well. And no he doesn't help me for real. It's just I'm nice to everybody. Even though, they never really help me in return. I'm just being the best girlfriend ever. But anyway... she's constantly making statuses calling me dumb for staying with him. I know he's sleeping with other women and possibly have another baby on the way. I just don't care. I mean I do still love him. we been together almost 9 years. I'm helping him get his life together. He said she's lying on him too. I don't know. She did send me screenshots of him contacting her asking her for sex. She told him that she's talking to someone else. I don't know. It's just too much. I hope she leaves me alone. He doesn't have to post me or anything. I never asked him to post me on Facebook or anywhere else. I feel like people are laughing at me. Am I dumb for helping him even though his baby mother told me he he begged her for sex and sent the screenshots? Im embarrassed. But I don't want to leave him ALONE either. I have dated other men , but we always end up back together.

She said she's mad that I had people watching her. Which I did. I just wanted to make sure HE wasn't at her house holding the baby he HAD ON ME.

Am I dumb for helping him even though his baby mother says he's begging her for sex?
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