My husband is 36 and very confused at times forgets events when he behaves out of character

My husband is 36 and very confused at times forgets events when he behaves out of character like anger rude talking to different women he will later no recall the events when asked after some time. My husband works still collecting blood in pathology he likes to look after his family me and our two Chn 10 and 2. But I am starting to feel really not coping as he refuses treatment and says there is nothing wrong with him. Since 4 years this started he also started smoking and drinking wines which seems to be getting better he smokes1-2 cigarets a day. Drinks at times one wine a day or 2 beers. When he is really confused he seems to start womanising and I behaves like he is not married then later he cannot remember for example 3 years ago he was talking to a Uni student while he was there and had an affair when he was alert he told her to leave him he is married I was there and asked me to reinforce. Then last year two years later that woman 31 contacted my husband to say she had his son who had a terminal genetic condition. My husband then was asking me to speak to her and said he does not know her looking very distressed. Then the woman just vanished. We have not heard since. Now he is mental again he is telling me a woman with 4 kids is having his child I should be proud of him. This is not normal coming from a very traditional person. We are from Africa so it appears the women are putting spells on him. I don't know how he can get better he says upsetting and strange things. We have had a happy marriage since 2004 this all started 2013. So I know something is very wrong. He was a very caring and loving husband who would do anything for me and our lives has changed at the blink of an eye. He is ok with the Chn but was exceptional before his craziness started. He sleeps home every night and pays bills but uses his mobile to talk to strange women constantly after some time changes. All his problems started after meeting his evil friend I do not know what he did to my husband. My husband functioning has declined especially he does not understand his role as a husband. He tries to look after his Chn n wife but the constant calls and texts from strange women demanding him to divorce and come to him know no bounds. He seems unable to have the strength required to make boundaries.
Any insight