All of your quest for reassurance from him probably feels pretty smothering for him. The other message you are giving him is that you don't trust him. I say this because my husband has gone through phases of being very needy, and it absolutely drove me crazy and made me pretty angry also.

Different people have different relationship styles. Your boyfriend sounds a lot like me. He isn't terribly demonstrative. But that does NOT mean he doesn't care about you or that he is "lazy in love". He just has a different style and personality type than you. So, you really are trying to get him to behave in a way that is not natural to him. That can feel very pressuring and suffocating after awhile.

If you want this relationship to work, you are going to have to do some trusting and give him some space about this. You might sit down and have a discussion about what would be comfortable for both of you. That's going to take some compromise from both of you. What will work will probably have to be somewhere in the middle.

Can you deal with a little less reassurance than you desire? Can you try to develop a trust in his feelings? Can you back off enough to give him some breathing room?

Those are things you really need to consider in deciding whether this relationship will work for you. This is probably also a really good topic for work in therapy as you seem to indicate this is a pattern for you.