Why does my boyfriend only spend time with me when someone else is around?

Its sort of healousy for me.. but he only soends emtime with me when someone else is here (ie: another girk or a guy.. we have been together for 3 years... and it sucks he brought over his female best friend (she's new) and i let them eat dinner together since she comes over every Saturday, but they have lively conversation however with me i know nothing about him and we have a 3 month old together for context. But whenever we eat dinner he doesn't talk to me like he does with her... usually he ignores me all weekend and when we eat he's just silent and eats as fast as he can... he also won't go to bed with me every night.. like i wake up alone and he's in the other bedroom i guess watching porn.. I don't know. What the hell is his problem?

Why does my boyfriend only spend time with me when someone else is around?
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