What does it mean when you been mad at your boyfriend for too long?

I feel like I get mad at him for little things i been in a poly relationship for 7 years and ever since our girlfriend had the abortion and he has been lying to her and i don't know if he has been lying to me as well but i feel like ever since that abortion and she has been getting all the attention, love,
Caring lies etc has kind of made me mad especially because before the abortion they were having sex all the time and that's how she got pregnant and he made her have an abortion due to his financial situation and him telling me he didn't want it to be a dad, him saying he was lost, depressed, confused etc so no he is trying to telling her the "true" (more lies) saying they will
Get married building emotional support but before it was all about the sex the pregnancy comes around every thing becomes chaotic then the abortion comes and everything becomes even more chaotic
What does it mean when you been mad at your boyfriend for too long?
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