Struggling on what to think 😣

So currently I’m in a relationship with a boy I’ve been dating for nearly 5 months now, I’m happy with him, but sometimes I’m not. He has a different sense of, let’s say, humour to me.. e.g, sometimes he will comment on how other girls look, call them ‘fit’ or that they have a nice bum, right in front of me. He’s even done it after sex before... he tells me that I should wear makeup more often because he sort of prefers me that way. We argue over stupid things sometimes n we hardly ever have a proper conversation, he does treat me a lot better then how my ex did. But now, my ex has decided to message me again, he says that he’s in a happy relationship too but I don’t think he loves her because he still randomly asks questions such as ‘would there be another us?’ Or ‘do you love your boyfriend more than you loved me?’ I have said no to the first question n yes to the second, but I hate saying it too him because he’s not happy himself, every time I question why he’s come back again all he can say is that he ‘doesn’t know’ and he keeps talking about the old memories we had, and he asked me how I truly felt in the relationship we had, and he was deeply apologetic about it. (I have no feelings for him whatsoever, I’m just helping him through a though time, I’ve told him constantly that I’m happy with my boyfriend now, and that I love him) but I feel guilty even talking to him. Me n my ex went through a rough relationship, and I never felt good enough. So I was thinking that maybe me feeling like that in my previous relationship is having an effect on my relationship now? I did genuinely love my ex, I tried to give him my everything 💔. My parents question me, and ask if I’m truly happy with my current boyfriend, and sometimes I hesitate when that questions mentioned.. i do want my relationship to work out, but I just feel like my heads stuck in two different places.. I don’t know what to do about any of the situations I’m in, I’m wondering if someone can help...? I know I’m probably going to get told that I need to speak to my boyfriend now about my ex messaging me, but I just can’t because I’m afraid of loosing him...