Wtf does this mean ?

Mirandia • Mirandia

So my husband cheated on me while I was pregnant back about 6 months ago with a female he works with I forgave him and gave him another chance because we have been together 6 years and we were having a baby together. So fast forward to about January I saw a txt pop up on his phone from Lisa the same bitch from back then ... it said hey he said happy birthday with a heart ... I confronted his ass he said it meant nothing blah blah she don’t work with him anymore we moved past it but lately I have the feeling like deep inside that he is cheating on me idk y I have not gotten any evidence or anything I haven’t looked through his phone or anything more because I’m afraid to find something but he has been acting distant and kinda like nervous around me just like he is hiding something idk am I crazy ?

Editttttt: when I say cheated I found messages in his phone dirty messages between them and he claimed they never fucked but I still consider this cheating