Is my husband seeing someone else??

So the past year my husband and I have had some MAJOR marriage issues due to him leaving me and our child and at the time I was pregnant, he would take off once or twice a week and not come home and not tell me where he was and just a bunch of red flags. I usually would find out where he was. He would go to his sisters and drink and do other drugs that I am NOT okay with, when my husband drinks he drinks to get drunk, with that being said he is a major flirt when he is drunk. It’s just his personality. His sister always has a bunch of girl friends over, well we have been doing dog for the past 2 months. Last night he never came home from work and went to his sisters. He didn’t get home until 330am. He immediately took a shower, was being very rude to me saying how he “thinks” he loves me (after 6 years together) belittling me, telling me he wants to leave me and I’m nothing but a bitch, not sure what he expected to happen when he’s done nothing but physically, mentally and emotionally abuse me for the past year and left me and our daughter for the party life. Well when he was in the shower I was looking through his clothes he wore, his shirt didn’t smell like his cologne, it had a smell but not a manly one. Then his boxers has cum all over them. He tired to say it was from when he went pee that he dribbled. You could clearly tell it was cum considering it was colored like it and a thicker substance. Well this morning I looked again. Their hard as a rock. So indeed it was cum, now I’m sure he will come up with a new lie and say he was watching porn and got off. But with what the past year has brought us idk what to believe anymore. Our youngest is 3 months old and I’m VERY insecure about how I look right now, especially after what he said last night. I don’t know what to do. I feel stuck as I’m currently unemployed and have been trying to get a job while going to college. I feel like he uses me to raise his kids, clean the house and make sure bills are paid and insurance and things like that are taken care of. He does NOTHING but work. I do everything else. And he never even gives me enough money for bills. He give me probably half of his pay checks. Which I get nothing for myself or our children. I usually have to barrow money from my mother for groceries or formula. Then he spends his half on himself... I understand he is the only income right now but when I was the only one working when he was laid off I worked two jobs., cooked, cleaned, and took care of our daughter while he played video games. Seems like the past year has created a man I don’t even know anymore. I look at him and I don’t love who he has become. I love the man I married. And he’s simply not him. 😔