Is it normal to get bored and lazy of making new friends?

I love having friends, having people you can socially depend on. But recently it seems im hardly motivated to make new friends. Sometimes its hard because making friends require time and commitment. although i like having friends i also like being by myself. I like making my own decisions & doing my own things during my time. Sometimes, i dont have the patience to make new friends anymore. It seemed easier during my teen years because i had more time to invest on & build friendships.

what makes it even harder now is that i am in a serious relationship and over the years i realise it gets hard dividing your attention with that person and your friends.

in my case, the person i am with can easily feel neglected and i am always bad at multi-tasking and dividing my attention when i am with friends. The person i am with also sometimes quickly makes bad assumptions about me making new friends or sometimes does not like the idea of me hanging out WITHOUT him. This is especially true with guy friends. There is a level of mistrust that i do not understand. Although he doesnt stop me from doing so, there is always tension in the air when i do. Now, to avoid all the drama, i simply lack the effort of making new friends.

i do keep old friends, but they all too have new friends and are going their separate ways. is it normal that i should stay like this?