The man I am dating has made it clear that he doesn’t want a commitment of any sort. He says we’re great together in a casual relationship, but anything that goes on for too long only upsets him and ends up causing pain. I understand where he’s coming from, but I think he’s using his past experiences to assume this will also end up being awful. I love him a lot and think we’re great together, and I just want him to see it the way I do so he can change his mind about us. I don’t want to break up but I don’t know if continuing this until he changes his mind will only end up hurting me.
If he is being honest and your expectations don’t match, you have to know the risks you’re taking by continuing this in the hope that the situation will change. He may see things from your perspective, of course, but you are both choosing to be in a relationship based on needs that are different. If he isn’t going to change his mind, you have to ask yourself how long you are prepared to wait because the sooner you have that conversation with yourself, the easier it will be to make a decision that protects you from this not working out.

My husband left his laptop open, and I saw that he had received an email from his ex-girlfriend. He hasn’t mentioned this to me in two days, and I don’t know if I should worry. If he isn’t being honest about this, should I confront him or am I being too possessive?
You are married to this man and have every right to ask him a question if there’s something on your mind. It’s better to be open about these things to avoid any misunderstanding because there may be a perfectly reasonable explanation. To jump to conclusions without facts doesn’t resolve anything, so work on keeping lines of communication open for the health and future of your marriage.