Boyfriend hasn't said I love you after 8 months

we have been exclusive for 8 months and we dated for 4 months before that. We see each other pretty much everyday, have plans for future trips, takes care of me and always wants me there with him. For the most part our relationship is great except this one thing that has been gnawing at me.

He still hasn't said I love you. There have been multiple times where I have had to bite my tongue to not say it. I would like to hear it from him first because when he says it I want to know he is saying it because he means it and wants to say it not because he feels obligated.

I feel as though this has made me question his feelings for me. The few problems we do have are about him not being considerate of my feelings. But at times I feel as though its not intentional its because for lack of better words he is just dumb when it comes to that. He is 25 and has never been in a serious relationship.

At this point I don't know what to do because I love him and he is my best friend but my resentment is starting to ruin our relationship and I don't know what to do or what to think about this
Boyfriend hasn't said I love you after 8 months
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