Will this guy change, this is a long read, if you have a baby with a man who's cheated several times with 7 different women, will he finally change?

I have a friend, let's call her Lisa. She has a boyfriend, let's call him Joe.
Lisa and Joe have been dating for almost 2 years now. The problem is, Joe has never really been faithful to Lisa. Out of the 2 years they've been together, he was only faithful for like 4 months in total. The first 2 months, and maybe 2 months combined after that.
Joe has cheated on Lisa with about 7 different girls during the 2 years, and this isn't including him having dating apps like tinder or pof or even contacting Craigslist for the single women who just look for hookups. Joe says he never cheated when he was on the dating apps, but he was just interested to see who he could get, possibly.
Out of the 7 girls Joe cheated on Lisa with, 2 of them became very serious, to the point he lived with her without Lisa knowing. It didn't work out. The most recent girl, he is very close to her still. Joe will not stop contacting her. He told Lisa that he is in love with her, but he loves Lisa too. He said that Lisa is the best woman for him, despite all the cheating and lying, and he'd like to start a family with her.
Lisa is now pregnant. She is 4 months pregnant with his baby. Joe still tries to contact the recent girl he cheated on Lisa with. He was with this recent girl for the longest, about a year of all the girls he cheated on Lisa with. Joe developed strong feelings for this other woman, despite Lisa being pregnant with his child, despite Lisa being with Joe for 2 years, despite Lisa putting up with him, cooking, cleaning, and being there for him, He still is torn in the middle between Lisa and the other woman. Lisa would like to give Joe 1 last chance, but he still wants to be with the other woman while he's with Lisa.

What should pregnant Lisa do? Should she stay or go? If the other woman is out of the picture, will Joe finally stay faithful to Lisa? Is this a lost cause?
Will this guy change, this is a long read, if you have a baby with a man who's cheated several times with 7 different women, will he finally change?
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