Would like to start off by saying most of the people on this forum are vile bullies. The way some ""women"" on here speak to others is disgusting and borderline bullying. 10 pages of mostly vile and unnecessarily condescending comments on this thread alone. Hope youre okay.
With regards to your question, it is entirely down to you whether or not you start a relationship with this person. I would advise to proceed with caution, however. My sister dated someone who did 5 years in prison for drug related offences, and went to prison as someone he sold MDMA who died (18yo). I hated him for this. As a mother, if this happened to my child/ren I would be out for blood. The guy himself was lovely, at first. Really nice, friendly, polite, always bought my sisters flowers, helped her move house, fitted her oven for her, took her out all the time - all of it. Then after a while, came his true side. He went back to smoking weed and started heavily drinking.
Causing arguments, breaking her stuff 'by accident', stalking her, eventually dressing like her. It was terrifying.
As others have pointed out, prison has a horrific impact on these individuals that we simply cannot comprehend without experiencing it firsthand.
He told my sister he would see other inmates hanging / dead in their cells on a regular occassion. The prison guards would joke about it. Much more said than this but won't go into it as its truly horrific.
If you have children, I wouldnt date him. I also wouldnt live with him for a long time if you do choose to date him. Really take it slow.
Just because that happened to my sister doesnt mean it'll happen to you with this guy, everyone is different. But its a hell of a lot more likely given his time inside.
Whatever you decide, just be really careful. Just because hes been to prison doesnt make him a monster, and people can and do change, with the right help and support.
Choose wisely OP, really take time to think about it. I hope it all works out for you, I really do.