Haven’t had sex in years…literally

Long story short since my daughter was born April 2019, I’ve had sex with her dad 2-3 times. Since we aren’t together this year I started to open up and try online dating. And it just sucks…but I want to have sex so bad. My libido is thriving again and I just wanna do the deed. Is it a bad choice to have a fwb for this reason? I’ve had a fwb when I was in my early 20s and it ended really really bad and I vouched never to have one again. But I know I’m not ready for a relationship either. Then the other part of me doesn’t want to have sex with another man other than my baby daddy. We all live together but we’re like roommates since 2019. Last time I slept with my baby daddy was in 2021.

And to give backstory, I’ve been with him since late 2011, so it’s been a hot minute. I’m not with my baby daddy since 2019 because he cheated on me several times and I absolutely feel nothing for him now. But a part of me wants to hold onto it and having sex with another man makes me feel like I’ll destroy my daughters chance of being raised by 2 parents. And yes we live like roommates but we are always respectful to each other and still do family fun times and activities with our daughter. I feel like I’m stuck in a hole. I also feel scared af to have sex with another man just in general (bc I’ve been with my baby daddy since 2011). Advice?

Update 1: my relationship with him is completely platonic. Since our daughter was born, except the 2-3 times I’ve mentioned above we had sex. But the last time we had sex was in June 2021. And to give more clarification, we are legally married. But again, still like roommates because I don’t have any feelings for him like that. I feel gross when I think about having sex with him. But I’m still wanting another baby and high sex drive.