Nowhere to rant! -_- it's long sorry

I absolutely adore my OH, more than I can describe. But just recently he's gone funny, since we found we were expecting #2, and now I've just had to hold back emotional pregnant tears because he's sending me texts because I ask for too much. I don't like thinking of myself as this, I asked if I could put some money into a leaving present for a friend, and have lunch. It didn't come to much, but it was his wage so I asked. And today I asked him to pick us something different for dinner. And he went on one saying I need to stop asking for "this and that" he's out at the minute so he didn't see me cry thank god, but it just hurt my feelings that he thinks that of me. When I only ask because it's not my money to spend, or I need to check with him. Am I being unreasonable? I hope I'm not I'm trying not to get upset but it's hard. I also suspect he's been texting an old flame he's cheated on me with several times, I saw her "nickname" on his phone the other day and he played dumb but I know what I saw. Does anybody think that's why he's been off lately? He doesn't talk much, or show much affection these days, but apparently it's me that's not being loving enough :(