My boyfriend says I’m loose sometimes

So I had my son may 10th I pushed him out I got a few stitches wasn’t to bad at all after I gave birth tbh I didn’t feel much pain which is weird cause I had stitches but I was horny ASF like literally after . Me & my boyfriend started messing around again 2 weeks postpartum now he says I’m loose sometimes which makes me so sad like depressed cause I want to be bomb everytime ya know I want to be tight not to tight but just right to feel good for my man. I’m pregnant again too with twins I’m due March 30th & I’m scared to push them out because I’ll be 10 times looser I guess... I’m sad I miss my tight vagina i notice a difference sometimes too like if I get to wet for him I get looser if I’m not that horny or there wasnt no foreplay I guess I’m tight he’s saying ive been tight lately & I think it’s because I have a uti 🤦🏽‍♀️ idk what’s going but could it be because I didn’t wait my 6 weeks if I knew this would happen I would’ve waited I’m so mad at myself I don’t feel good enough & he has cheated on me in the past told me their pussies were better and this was after I had my son. Makes me sad someone give me tips how to get my tight vagina back