He compares me with his ex always

My boyfriend and I have been in a relationship for six months but whenever we have an argument, he makes comparisons between me and his ex-girlfriend. I don’t react to this, but it sometimes feels as if he wishes things had worked out with him and his ex. I am made to feel like an afterthought, like someone he chose to be with only because he couldn’t fix his previous relationship. If he keeps doing this, I am thinking of ending this because I don’t like how it makes me feel. Am I being unreasonable? I don’t want to come across as someone insecure, but he isn’t making me feel loved. What should I do?
You should absolutely end this relationship if you aren’t feeling loved or if you are made to feel like an afterthought. The onus of fixing this isn’t on you, and comparisons with his ex should be stopped if they cause you pain. Not mentioning it is a bad idea because it needs to be called out. If he persists despite being told about this, you are clearly not being listened to or respected. Always rely on someone’s actions rather than words alone, because intent and mutual respect matter. Tell him what’s on your mind, give him an opportunity to stop this hurtful behaviour and, if things don’t change, do what is best for your well-being and mental health.

I want to know more about a guy I work with but don’t want it to look like I’m hitting on him because that may make things awkward for both of us. How do I do this in a subtle manner?
You can always initiate conversations and ask questions. If he isn’t comfortable answering them, he will let you know. If he is more comfortable talking outside an office environment, ask him out for coffee. If you are worried about him misinterpreting this, you can be direct and tell him you would like to get to know more about him because you find him interesting.