Just lost

So me and my bf been apart for a few months but I seen him every month while gone.... I'm going back home for good this month (26th)....I miss him like crazy and he say he miss me...but lately we hardly talk on phone, we barely text like that.... Everytime I call he don't pick up and I can text for hours and get nothing..... He will ask me randomly if I met someone where I'm at and I tell him no cause I haven't and not trying to!....I love him to death I'm pregnant with our first child together.... But I'm starting to feel like he doing other shit while I'm gone....I understand he be trying to get money and etc but it ain't hard to pick up and call or text..... Part of me feel like it may be someone else but I trust her wouldn't do that to me cause he always talk about how cheating is nasty especially being with someone and he would just leave if he wanted to do whatever and I feel same way.... He the only person that calls me and text... No one else... He is literally all I have (no friends or anything).....I'm just so lost/confused about me and his relationship right now....I don't know where he is standing with us! If I ask he be like I'm still with you and talking to u... If I was done I wouldn't talk to u and etc..... This is just breaking my heart! Me and him made it this long apart and now the month I'm going back home everything just seems like it it's switching up on his end!!! I'm confused any advice no bashing please