need advice

so my boyfriend and I have sex pretty regularly (about 3 to 5 times a week) and he has never had a problem cumming before. well I went on vacation and haven't seen him in about 2 weeks and when I got back we tried having sex and he couldn't come. we tried 3 times and went at it for a while be he just couldn't do it. this has never happened before. has anyone else had this problem? he says it's because he hasn't had sex in a while? but I feel like that would make him come faster. he says it's not me but I have gained weight the past couple months and I'm just worried he's not attracted to me as much. ugh!! I probably sound so rambly but I'm just so worried. does anyone have any advice or tricks on how to get him to cum again?

I couldn't even get him off with a blow job and that has never failed!!