<human>: Condense the text into a few key points

Hi everyone,

I have been with my boyfriend for almost 3 years now. Things were great and we both love each other very much. We just recently moved in together and we have a very happy house. We both can see each other in the future together with kids, a dog and maybe even a cat.

Things in the past week hasn't been so great. A week ago he admitted to me that he has had a nagging fear of missing out on other girls. That he gets a little confronted thinking I'll be the last girl he will ever sleep with. He has been with several girls in the past and in polyamorous/open relationships in the past as well.

I know very well I can't ever do open.

He sees sex and relationships as two separate things.

He now says he needs some time to evaluate each choice carefully and statistically. (he's a data scientist). He doesn't know when he will know.

I understand he is being faced with a very difficult choice. It has been really difficult for me this past few weeks due to my anxiety telling me that I am not good enough for someone to stay. I've contemplated just breaking up now because it really sucks being in this limbo and just not knowing. I am someone who wants a family and a stable relationship and now I am ruminating on the opportunity cost of just staying in this limbo like state and going out to meet someone with the same outlook on a relationship. 

This is all complicated by the fact that we still love each other so very much.
<bot>: we both love each other but now he has cold feet about our monogamous future and needs some time to decide. I don't know if I should just leave.